  Linux IR HOWTO
  Werner Heuser, < wehe@snafu.de >
  v2.8, 20 September 1999

  An introduction to Linux and infrared devices and how to use the soft-
  ware provided by the Linux/IrDA project. This package uses IrDA(TM)
  compliant standards. IrDA(TM) is an industrial standard for infrared
  wireless communication, and most laptops made after January 1996 are
  equipped with an IrDA(TM) compliant infrared transceiver. Infrared
  ports let you communicate with printers, modems, fax machines, LANs,
  and other laptops. Speed ranges from 2400bps to 4Mbps. The Linux/IrDA
  stack supports IrLAP, IrLMP, IrIAS, IrIAP, IrLPT, IrCOMM, IrOBEX, and
  IrLAN. Several of the protocols are implemented as both clients and
  servers. There is also support for multiple IrLAP connections, via
  several IrDA(TM) devices at once. The Linux/IrDA project started at
  the end of 1997 and its status is still experimental, so please don't
  expect every feature working straight. AFAIK Linux/IrDA is the _only_
  open source IrDA implementation currently available. Remote Control
  (RC) via infrared is not the aim of the project, though partly treated
  in this HOWTO.
  ______________________________________________________________________

  Table of Contents



  1. Introduction

  2. Prerequisites

  3. Kernel

     3.1 General Parameters
     3.2 IrDA Specific Parameters
        3.2.1 IrDA subsystem support
           3.2.1.1 IrDA protocols
           3.2.1.2 IrDA protocol options
           3.2.1.3 IrDA compressors
        3.2.2 Infrared-port device drivers
           3.2.2.1 IrTTY (uses serial driver)
           3.2.2.2 Dongle support
           3.2.2.3 FIR support

  4. Linux/IrDA-Utils

     4.1 Compilation
     4.2 Precompiled Packages
     4.3 Contents of Linux/IrDA-Utils
        4.3.1 irmanager
        4.3.2 irattach
        4.3.3 load_misc
        4.3.4 /etc/irda
        4.3.5 irdaping
        4.3.6 irdadump
        4.3.7 gnobex
        4.3.8 irkbd
        4.3.9 irdalib
        4.3.10 obex

  5. Configuration

     5.1 General Configuration
     5.2 IrManager
     5.3 Low Level Drivers
        5.3.1 SIR
        5.3.2 Dongle Connection - Infrared Adapters for the Serial Port
        5.3.3 Dongle Connection - Infrared Motherboard Adapter
        5.3.4 Fast InfraRed (FIR)

  6. Specific Connections and IrDA - Protocols

     6.1 Printer Connection - IrLPT, IrTTP
     6.2 LAN Connection - IrLAN
     6.3 HP NetBeamer Connection
     6.4 Palm III Connection - IrOBEX
     6.5 Palm III Connection to IBM Thinkpad 600
        6.5.1 Prerequisites
        6.5.2 Adding support for IrDA
        6.5.3 Starting IrDA - First Steps
        6.5.4 Configuration Files
     6.6 Psion 5 Connection
     6.7 Cellular Phone Connection
        6.7.1 Ericsson
        6.7.2 NOKIA
     6.8 Digital Camera Connection
     6.9 Window$9x/NT and Linux/IrDA
        6.9.1 Introduction
        6.9.2 Connection between Linux/IrDA and Window$95 IrDA(TM)
     6.10 Linux to Linux Connection
        6.10.1 Connection Methods
        6.10.2 Compression
     6.11 Multiple Instances
     6.12 Connection to Docking Station
     6.13 Connection to Keyboard
     6.14 Connection via Serial Cable
     6.15 Peer-to-Peer Mode / Direct Mode

  7. Hardware Supported by Linux/IrDA

     7.1 Obtaining Information about the Infrared Port in Laptops
        7.1.1 SIR
        7.1.2 FIR
     7.2 Big Endian
     7.3 SMP
     7.4 Hardware Surveys

  8. Graphical User Interface (GUI)

     8.1 GNOBEX
     8.2 KDE

  9. Power Saving

  10. Beyond IrDA

     10.1 Extending Transmission Distance
     10.2 Upcoming Standards (Bluetooth and IrDA)

  11. Troubleshooting, Mailing List

     11.1 General Information
     11.2 Troubleshooting Techniques

  12. IrDA Network Neighborhood

     12.1 Laptop-Printer-PDA
     12.2 Bridging/Routing
     12.3 IPv6
     12.4 DHCP

  13. Linux/IrDA and APM

  14. Known Bugs

  15. FAQ

  16. Infrared Remote Control

     16.1 Resources
     16.2 Infrared Remote Control - IrDA

  17. Infrared and Eye Safety

  18. Credits

  19. Revision History

  20. Copyright and Disclaimer

  21. Appendix A - Configuration Script

  22. Appendix B - Serial Infrared Port Sniffers

     22.1 Sniffer by Gerd Knorr
     22.2 sersniff

  23. Appendix C - User space application for Psion 5 Palmtop Computers: psion.c

  ______________________________________________________________________


  1.  Introduction

                              Better red, than dead. - Unknown AuthorEss

  IrDA support for Linux started at the end of 1997. For 2.0.x kernels
  Linux/IrDA support worked in a totally other way and is no longer
  supported by the Linux/IrDA project. Since 2.1.131 and 2.2.0
  Linux/IrDA is part of the kernel. Please note that the status of the
  project just changed from experimental to stable with 2.2.10 kernels.


  Companies and developers which are interested in joining these efforts
  should contact the at Linux/IrDA Project <http://www.cs.uit.no/linux-
  irda/> or me at < wehe@snafu.de >.

  Some history about Linux/IrDA. The project started at the end of 1997
  with the name Linux/IrDA. Due to some troubles with the name IrDA,
  which is trademarked by the Infrared Data Association <idx>IrDA</idx>
  <http://www.irda.org/>, the name was changed to Linux/IR. At the end
  of 1998 the the relationship between both became better and the name
  was changed to Linux/IrDA again. Since February 1999 the project is an
  official member of IrDA <http://www.irda.org/members/members.asp> .


  This document is based on the "How to use" part of the Linux/IrDA
  project homepage <http://www.cs.uit.no/linux-irda/howto.html>. I also
  included material provided by the Linux/IrDA core team, the Linux/IrDA
  mailing list and other sources.

  The document is included in the LINUX DOCUMENTATION PROJECT
  <http://metalab.unc.edu/LDP>.

  The latest version of this document is available at LiLAC - Linux with
  Laptop Computers <http://www.snafu.de/~wehe/index_li.html> .

  Mathieu Arnold <arn_mat@club-internet.fr> provides the IR-HOWTO in
  French <http://www.mat.cc/> .

  The latest kernel I used is 2.2.3 and the latest irda-utils version is
  0.8.8 .

  I tried to check all information but I don't have all the necessary
  infrared hardware yet, so if something doesn't work for you, please
  don't blame me.

  Please feel free to contact me for comments or questions about the
  HOWTO. I know this material is not finished or perfect, but I hope you
  find it useful anyway. For other questions and current information
  about Linux/IrDA please ask in the Linux/IrDA mailing list as
  explained below.

  <Werner Heuser>


  2.  Prerequisites


  1. BIOS

     - Make sure your infrared port is enabled in the BIOS and check
     what interrupt and port address it uses. With some laptops it seems
     necessary to have Window$x installed to be able to set BIOS
     parameters.
  2. Docking Station

     I have got reports, that connected to a docking station the
     infrared port was disabled.



  3. Infrared Controller Chip

     - Make sure your infrared port is detected by the Linux kernel. For
     detailed information see the "Hardware Survey" section below.



  4. modutils

     - Make sure you use modutils 2.1.x by insmod --version. I use
     version 2.1.121.



  5. Shared Library

     - The shared library glibc2 aka libc6 is recommended. There are
     also efforts to use glibc2.1, you may get this at
     ftp://ftp.funet.fi/pub/gnu/funet/
     <ftp://ftp.funet.fi/pub/gnu/funet/> .

     - In some files you maybe have to change #include <net/if_packet.h>
     to #include <linux/if_packet.h> to get things to compile. This
     means using kernel headers instead of glibc headers. Please consult
     the mailing list archive, if your are interested in further
     information.

     - But libc.so.5 should work, too.

     - I am not sure wether you need the zlib library if you use the
     data compression features.



  6. IrLAN The latest release of net-tools (package netbase for
     Debian/GNU-Linux) is recommended, if you want to use an IrLAN
     connection. It's available from:
     ftp://ftp.netwinder.org/users/p/philb/net-tools/
     <ftp://ftp.netwinder.org/users/p/philb/net-tools/>,
     http://www.tazenda.demon.co.uk/phil/net-tools/
     <http://www.tazenda.demon.co.uk/phil/net-tools/> and shortly from
     ftp://ftp.cs-ipv6.lancs.ac.uk/pub/Code/Linux/Net_Tools/
     <ftp://ftp.cs-ipv6.lancs.ac.uk/pub/Code/Linux/Net_Tools/> .



  7. Graphical User Interface (GUI)

     Currently there are two graphical user interfaces for Linux/IrDA
     under development one for KDE and one for GNOME. See GUI chapter
     below. For the GNOME application you will need the Perl-GTK+ module
     and Python. You must also install all the development packages. To
     run Linux/IrDA I recommend to check the command line tools first,
     because the GUIs don't seem to be finished yet.


  8. Security

     - Most important, you must sync your disks!!! Maybe you have to
     reboot your machine. Have you read the disclaimer?



  9. Miscellaneous

     - Other useful progs: APSFILTER, EZ-Magic, MagicFilter or something
     similar for the printer configuration.


  3.  Kernel

  Please read the Kernel-HOWTO to get more information about the
  compilation process. You'll find the Linux/IrDA code in:

  /usr/src/linux/net/irda (protocol stuff)

  /usr/src/linux/drivers/net/irda (device drivers)

  /usr/src/linux/include/net/irda (header files)



  3.1.  General Parameters

  - Make sure you use kernel 2.2.x sources. If unsure about your kernel
  version try uname -r.

  - Get the latest kernel patch from the Linux/IrDA project
  http://www.cs.uit.no/linux-irda/snapshots/
  <http://www.cs.uit.no/linux-irda/snapshots/>. Or from the Alan Cox
  kernel series at ftp.linux.org.uk/pub/linux/alan/2.2/
  <ftp.linux.org.uk/pub/linux/alan/2.2/> . Put it into /usr/src or where
  else your kernel sources live and apply something like (replace
  patch-2_2.0-irdaXXX  with the actual file name):

  ______________________________________________________________________
  cd /usr/src
  tar xvzf patch-2_2.0-irdaXXX.tar.gz
  cd linux
  patch -p1 -l < ../patch-2_2.0-irdaXXX
  ______________________________________________________________________



  - Experimental support has to be enabled CONFIG_EXPERIMENTAL.

  - Enable sysctl in "General Setup" CONFIG_SYSCTL.

  - You should have proc file system support CONFIG_PROC_FS.

  - Also serial support for the SIR features CONFIG_SERIAL.

  - I am not sure wether there has to be printer support for using a
  printer with Linux/IrDA CONFIG_PRINTER. But I assume this feature is
  not necessary.

  - Networking support _must_ be enabled CONFIG_NET.

  - Make sure you have module support CONFIG_MODULES in your kernel!
  Test it e.g. with lsmod.

  - Also kerneld support CONFIG_KERNELD. But kmod (CONFIG_KMOD) also
  works. A monolithic kernel seems to work, too. But modules are highly
  recommended.

  - To use irdadump you probably have to set CONFIG_PACKET.

  If you only apply the Linux/IrDA patch, you should not have to do a
  make clean, so that should save you some time. I suggest you do
  something like this:


  ______________________________________________________________________
  make dep && make all && make modules && make install && make modules_install
  ______________________________________________________________________



  If you get really strange errors, then try to rebuild from scratch
  after a make clean.


  3.2.  IrDA Specific Parameters

  The following is my draft for
  ../linux-2.2.3/Documentation/Configure.help, parts are from Dag
  Brattli and Andreas Butz. Please consult the latest available kernel
  documentation for current information and new drivers.


  3.2.1.  IrDA subsystem support

  CONFIG_IRDA

  IrDA(TM) is an industrial standard for infrared wireless
  communication. Infrared ports let you communicate with printers,
  modems, fax machines, LANs, and laptops. Speed ranges from 2400bps to
  4Mbps. To use this features you need the irda_utils provided by the
  Linux/IrDA project http://www.cs.uit.no/linux-irda/ Further
  information you may find there and in the Linux/IR-HOWTO at
  http://www.snafu.de/~wehe/index_li.html Currently it is recommended to
  build IrDA support as modules only.  Please see
  Documentation/modules.txt. Please note the status of Linux/IrDA is
  still experimental.


  3.2.1.1.  IrDA protocols


  o  IrLAN protocol

     CONFIG_IRLAN

     Builds the IrDA network device. Use ``ifconfig eth0 <IP-NUMBER>''
     to configure it. - Just say Y


  o  IrLAN client support

     CONFIG_IRLAN_CLIENT

     If you connect to infrared devices via IrLAN one has to be the
     server and the other the client. You can use both the client and
     the server at the same time. The first one to connect becomes the
     client. - Just say Y Note: The latest patch includes peer-to-peer
     support instead.


  o  IrLAN server support

     CONFIG_IRLAN_SERVER
     If you connect to infrared devices via IrLAN one has to be the
     server and the other the client. You can use both the client and
     the server at the same time. The first one to connect becomes the
     client. - Just say Y Note: The latest patch includes peer-to-peer
     support instead.


  o  IrOBEX protocol

     CONFIG_IROBEX

     IrOBEX is a protocol for exchanging objects (files, vcards, etc.)
     over an infrared connection. You can use it to exchange files
     between linux and a PALM III. IrOBEX can also be used between two
     Linux boxes, Linux and Windows95, etc. - Just say Y


  o  IrCOMM protocol

     CONFIG_IRCOMM

     Over IrCOMM you may communicate with cellular phones, etc. To use
     this service you have to build a new device with ``mknod
     /dev/irnine c 60 64'', which works like /dev/ttySx. - Just say Y
     ..Note: major and minor number are still not the official ones yet.
     For latest improvements (IrSocket is on the way!), please look at
     the page of Takahide Higuchi
     http://www.pluto.dti.ne.jp/~thiguchi/irda/

     ..Note: At the moment IrCOMM seems to crash your kernel easily, you
     should probably wait for the next patch.


  o  IrLPT client support

     CONFIG_IRLPT_CLIENT

     Say Y here if you want to build support for the IrLPT client
     protocol. If you want to compile it as a module, say M here and
     read Documentation/modules.txt. The IrLPT client protocol can be
     used to print documents to IrDA compatible printers like the
     HP-5MP, or IrLPT printer adapters like the ACTiSYS IR-100M. - Just
     say Y


  o  IrLPT server support

     CONFIG_IRLPT_SERVER

     Say Y here if you want to build support for the IrLPT server
     protocol. If you want to compile it as a module, say M here and
     read Documentation/modules.txt. The IrLPT server protocol makes it
     possible to use a Linux machine as an infrared printer server for
     other laptops. So if your Linux machine has a cable connection to a
     printer, then other laptops can use the Linux machine to print out
     documents using infrared communication. - Just say Y



  3.2.1.2.  IrDA protocol options

  CONFIG_IRDA_OPTIONS

  You may define some IrDA protocol options.


  o  Cache last

     LSAP CONFIG_IRDA_CACHE_LAST_LSAP

     Say Y here if you want IrLMP to cache the last LSAP used. This
     makes sense since most frames will be sent/received on the same
     connection. Enabling this option will save a hash-lookup per frame.
     If unsure, say Y.


  o  FAST RRs

     CONFIG_IRDA_FAST_RR

     Use this option if you want to send faster RR (Receive Ready)
     frames if the transmit queue is empty. This will give you much
     better latencies but will consume more power, because of the
     bouncing RR frame.


  o  Recycle RRs

     CONFIG_IRDA_RECYCLE_RR

     In the normal life of the IrLAP protocol, it sends a lot of small
     RR (Receive Ready) frames over the link (at least when it has
     nothing else to do). Saying Y to this option will make IrLAP
     recycle these frames thus avoiding many alloc_skb's and
     kfree_skb's. To do this it will only buffer one of these frame
     which is enough for the usual case.


  o  Debug information

     CONFIG_IRDA_DEBUG

     Say Y here if you want the IrDA subsystem to write debug
     information to your syslog. You can change the debug level in
     /proc/sys/net/irda/debug.  If unsure, say Y (since it makes it
     easier to find the bugs).


  3.2.1.3.  IrDA compressors

  CONFIG_IRDA_COMPRESSION

  You may use the compression methods BZIP2 and BSD. These are not IrDA
  standard. This will allow two linux boxes to handshake compression. It
  should be compatible with other IrDA devices, although communication
  will not be compressed then.

  o  Deflate compression (experimental)

     CONFIG_IRDA_DEFLATE

     Say Y here if you want to build support for the Deflate compression
     protocol. If you want to compile it as a module, say M here and
     read Documentation/modules.txt. The deflate compression (GZIP) is
     exactly the same as used by the PPP protocol. Enabling this option
     will build a module called irda_deflate.o.


  o  BZIP2 compression

     CONFIG_IRDA_BZIP2

     Help not available yet.


  o  BSD compression

     CONFIG_IRDA_BSD

     Help not available yet.



  3.2.2.  Infrared-port device drivers

  Three sorts of low level infrared drivers are available: serial,
  dongle and FIR.  They will show up in /proc/net/dev (irda0) after
  initialisation.



  3.2.2.1.  IrTTY (uses serial driver)

  Most IrDA chips support StandardInfraRed (SIR), which works up to
  115200bps and emulates a serial port (16550A UART). On many laptops
  this port is detected by the serial support of the kernel, see
  ``dmesg''. IrTTY connects the Linux/IrDA services to this port. - You
  should say Y here.

  o  Serial dongle support

     CONFIG_IRTTY_SIR

     Say Y here if you want to build support for the IrTTY line
     discipline. If you want to compile it as a module, say M here and
     read Documentation/modules.txt. IrTTY makes it possible to use
     Linux's own serial driver for all IrDA ports that are 16550
     compatible. Most IrDA chips are 16550 compatible so you should
     probably say Y to this option. Using IrTTY will however limit the
     speed of the connection to 115200 bps (IrDA SIR mode).  If unsure,
     say Y.

  3.2.2.2.  Dongle support

  CONFIG_DONGLE

  Currently four dongles (infrared adapters for the serial port) are
  supported. The dongle is an infrared device which may be connected to
  serial port, if you don't have built-in infrared support for your
  machine. If you use a dongle together with a laptop you maybe have to
  disable the IrDA support in the BIOS.

  o  ESI JetEye PC dongle

     CONFIG_ESI_DONGLE

     Say Y here if you want to build support for the Extended Systems
     JetEye PC dongle. If you want to compile it as a module, say M here
     and read Documentation/modules.txt. The ESI dongle attaches to the
     normal 9-pin serial port connector, and can currently only be used
     by IrTTY. To activate support for ESI dongles you will have to
     insert ``irattach -d esi'' in the /etc/irda/drivers script.
     http://www.extendsys.com/support/ftp/infrared.html

  o  ACTiSYS IR-220L and IR220L+ dongle

     CONFIG_ACTISYS_DONGLE

     Say Y here if you want to build support for the ACTiSYS IR-220L and
     IR220L+ dongles. If you want to compile it as a module, say M here
     and read Documentation/modules.txt. The ACTiSYS dongles attaches to
     the normal 9-pin serial port connector, and can currently only be
     used by IrTTY. To activate support for ACTiSYS dongles you will
     have to insert ``irattach -d actisys'' or ``irattach -d
     actisys_plus'' in the/etc/irda/drivers script.
     http://www.actisys.com


  o  Tekram IrMate 210B dongle

     CONFIG_TEKRAM_DONGLE

     Say Y here if you want to build support for the Tekram IrMate 210B
     dongle. If you want to compile it as a module, say M here and read
     Documentation/modules.txt. The Tekram dongle attaches to the normal
     9-pin serial port connector, and can currently only be used by
     IrTTY. To activate support for Tekram dongles you will have to
     insert ``irattach -d tekram'' in the /etc/irda/drivers script.
     http://www.tekram.de/


  o

     CONFIG_GIRBIL_DONGLE

     Say Y here if you want to build support for the Greenwich
     Instruments GirBIL dongle. If you want to compile it as a module,
     say M here and read Documentation/modules.txt. The Greenwich dongle
     attaches to the normal 9-pin serial port connector, and can
     currently only be used by IrTTY. To activate support for Greenwich
     dongles you will have to insert ``irattach -d girbil'' in the
     /etc/irda/drivers script.  http://www.greenwichinst.com/



  3.2.2.3.  FIR support

  FastInfraredSupport (FIR) needs a specific controller chip, which
  supports up to 4Mps. - Just say Y

  o  NSC PC87108

     CONFIG_NSC_FIR

     NationalSemiConductor NSC PC87108 FIR chip e.g. used in the IBM
     Thinkpad 560X and ACTiSYS IR2000 dongle. Probably the NSC PC87338
     FIR chip is also supported. The driver supports SIR, MIR and FIR
     (4Mbps) speeds. - Just say Y


  o  Winbond W83977AF (IR)

     CONFIG_WINBOND_FIR

     Winbond W83977AF (IR) FIR chip e.g. used in the Corel Netwinder PC.
     The driver supports SIR, MIR and FIR (4Mbps) speeds. - Just say Y


  o  Sharp UIRCC

     CONFIG_SHARP_FIR

     Say Y here if you want to build support for the Sharp UIRCC IrDA
     chipset. If you want to compile it as a module, say M here and read
     Documentation/modules.txt. This chipset is used by the Toshiba
     Tecra laptops.



  4.  Linux/IrDA-Utils


  4.1.  Compilation



  o  Use the latest source snapshot of irda-utils available at
     http://www.cs.uit.no/linux-irda/irda-utils/
     <http://www.cs.uit.no/linux-irda/irda-utils/>

  o  Untar the package with tar xvzf irda-utils<VERSION>. I recommend to
     do this in /usr/src.

  o  Do a make depend.

  o  Do a make clean (not necessary if you compile the package for the
     first time).

  o  Do a make all to build the binaries.

  o  Do a make install, this brings irattach and irmanager into the
     right place and installs some config files in /etc/irda.

  A recommendation from Bjoern Hansson <Bjorn.Hansson@signal.uu.se>: If
  make depend fails on stdef.h and stdarg.h just add -I/usr/lib/gcc-
  lib/i586-linux/egcs-2.90.29/include/ or the according path for your
  system to the SYS_INCLUDES line in Makefile.

  To compile irdadump and irdaping (which are not necessary to get
  Linux/IrDA to work) you probably to tweek the source a little:

  Dag Brattli: " The problem is that I'm including kernel header files
  which conflicts with the libc header files. So why do I need to
  include kernel header files? Well, the libc/glibc header files does
  not know that much about IrDA (yet). The reason is just that IrDA is
  quite new. I could have just defined the stuff in the program itself,
  but then people would be able to compile the stuff even if the
  definitions had changed in the kernel. I think its better that you get
  a compile error than some possible strange behaviour. If you don't
  want to wait until I figure out how to solve this stuff, you can just
  remove the linux header files and define the constants in your program
  yourself:


  ______________________________________________________________________
  #define PF_IRDA          23
  #define AF_IRDA          PF_IRDA

  #define ARPHRD_IRDA      783
  #define ETH_P_IRDA       0x0017
  ______________________________________________________________________



  All the stuff above should not be changed, so it is probably safe to
  just hardcode them. I'll change the programs so they just includes the
  normal header files, and then defines these constants only if the
  header files didn't know about them. It should however be safe to
  include linux/irda.h ."
  Though I never succeeded to compile all utilities without errors, I
  recommend to use at least the latest packages of libtool, m4,
  autoconf, and automake if you want to compile irdadump, irdaping, etc.


  4.2.  Precompiled Packages

  NOKUBI Takatsugu provides an unofficial irda-utils Debian package
  <http://www.daionet.gr.jp/~knok/debian> (needs libc2.1). Efforts are
  on the way to include this package into the next Debian release,
  codename Potato.


  4.3.  Contents of Linux/IrDA-Utils


  4.3.1.  irmanager

  The irmanager is user-space daemon that is inspired and quite similar
  to the cardmgr used in the PCMCIA distribution. For example, if IrLMP
  discovers a remote device with IrLAN provider capabilities and no
  local IrLAN client has registred, then IrLMP will send an event to the
  IrManager and make it modprobe the module required. When application
  level clients are ready for communication and user-space
  configuration, they can also notify IrManager about this, so that it
  can execute the right script. For example will IrLAN send the event
  EVENT_IRLAN_START when the data channel is ready for exchanging
  Ethernet frames. When IrManager receives this event, it will execute
  /etc/irda/network start <devname> to configure the network interface.
  If you use the RedHat variant of it, it will in turn execute
  /sbin/ifup<devname> .


  4.3.2.  irattach

  Usually irattach is started by irmanager. irattach attaches an IrDA
  capable tty to the basic services of Linux/IrDA. If kerneld or kmod
  are running, the modules irda and irtty are loaded automatically, if
  not you have to load them by hand in that order. It is recommended to
  start irattach in the background. To stop irattach just kill the
  process.


  4.3.3.  load_misc

  A Perl script which loads a Linux/IrDA module and builds the according
  device in /dev using mknod.


  4.3.4.  /etc/irda

  Configuration files, e.g. contains the serial port of the SIR driver:


  ______________________________________________________________________
  drivers
  network
  network.opts
  obex
  ______________________________________________________________________



  You should at least configure the IR driver drivers:


  ______________________________________________________________________
  #! /bin/sh
  #
  # drivers
  #
  # Initialize and shutdown IrDA device drivers.
  #
  # This script should be invoked with two arguments. The first is the
  # action to be taken, either "start", "stop", or "restart".
  #

  action=$1
  device=$2

  case "${action:?}" in
  start)
      irattach /dev/ttyS2          # The third serial port is an IrDA port
      # irattach /dev/ttyS0 -d esi # Attach a ESI dongle to the first serial port
      # insmod pc87108             # If your machine as a pc87108 FIR chipset
      ;;
  stop)
      killall irattach             # ... or something. Currently not used
      ;;
  restart)
      /sbin/ifconfig ${device:?} down up
      ;;
  esac
  ______________________________________________________________________



  4.3.5.  irdaping

  This is a program similar to ping(8). It sends IrDA test frames (added
  some userdata which contains the frame number and the time the frame
  was sent). You can also change the size of the frame by using the -s
  option. You must supply an IrDA device address, and not an IP address.
  You have to be able to get that device address by some method
  irdadump?

  Here is one output sample (pinging an ACTiSYS IR-100M):


  ______________________________________________________________________
  dagbnb /home/dagb/linux/irda-utils/irdaping/ # ./irdaping 0xf7be8388
  IrDA ping (0xf7be8388): 32 bytes
  32 bytes from 0xf7be8388: irda_seq=0 time=102.466003 ms.
  32 bytes from 0xf7be8388: irda_seq=1 time=102.202003 ms.
  32 bytes from 0xf7be8388: irda_seq=2 time=102.170998 ms.
  32 bytes from 0xf7be8388: irda_seq=3 time=101.633003 ms.

  4 packets received by filter
  ______________________________________________________________________



  4.3.6.  irdadump

  One advantage of implementing IrDA device drivers as network device
  drivers is that you should be able to attach sniffers to the device
  (or actually the packet type). That way, it is possible to use a
  really handy utility called irdadump (instead of tcpdump). This will
  make debugging MUCH easier. Linux-2.2 implements the BPF (Berkeley
  Packet Filter), so its possible to filter out exactly the frames you
  want to see.

  Note: You probably have to be root for using irdadump . CONFIG_PACKET
  has to be enabled in the kernel. If compiled as a module you might
  load the module manually. irdadump has been coverted into a library,
  so it can be used from GUI applications as well.

  Here is a sample output of a small session between Linux and a Palm
  III. This log shows that the local irobex layer is not responding, so
  the Palm III sends a disc frame.


  ______________________________________________________________________
  dagbnb /home/dagb/linux/irda-utils/irdadump/ # ./irdadump

  20:18:15.305711 xid:cmd:saddr=0x05c589 > daddr=0xffffffff,S=6,s=0
  20:18:15.385597 xid:cmd:saddr=0x05c589 > daddr=0xffffffff,S=6,s=1
  20:18:15.465568 xid:cmd:saddr=0x05c589 > daddr=0xffffffff,S=6,s=2
  20:18:15.545953 xid:cmd:saddr=0x05c589 > daddr=0xffffffff,S=6,s=3
  20:18:15.625574 xid:cmd:saddr=0x05c589 > daddr=0xffffffff,S=6,s=4
  20:18:15.705575 xid:cmd:saddr=0x05c589 > daddr=0xffffffff,S=6,s=5
  20:18:15.785601 xid:cmd:saddr=0x05c589 > daddr=0xffffffff,S=6,s=255,info=Linux
  20:18:18.075526 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=0
  20:18:18.225498 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=1
  20:18:18.375495 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=2
  20:18:18.526355 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=3
  20:18:18.675614 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=4
  20:18:18.676364 xid:rsp:saddr=0x05c589 > daddr=0xb50c14b,S=6,s=4
  20:18:18.765506 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=5
  20:18:18.927221 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=255,info=Palm III
  20:18:18.975796 snrm:cmd,ca=0xfe,pf=1
  20:18:18.976534 ua:rsp,ca=0x58,pf=1
  20:18:18.977145 ua:rsp,ca=0x58,pf=1
  20:18:19.585627 rr:rsp,ca=0x58,nr=0,pf=1
  20:18:19.585810 rr:rsp,ca=0x58,nr=0,pf=1
  20:18:19.606413 i:cmd,ca=0x58,nr=0,ns=0,pf=1
  20:18:19.606582 rr:rsp,ca=0x58,nr=1,pf=1
  20:18:19.627708 rr:cmd,ca=0x58,nr=0,pf=1
  20:18:19.627871 i:rsp,ca=0x58,nr=1,ns=0,pf=1
  20:18:19.650571 disc:cmd,ca=0x58,pf=1
  20:18:19.650736 ua:rsp,ca=0x58,pf=1
  20:18:21.165524 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=0
  20:18:21.315608 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=1
  20:18:21.315793 xid:rsp:saddr=0x05c589 > daddr=0xb50c14b,S=6,s=1
  20:18:21.395499 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=2
  20:18:21.545516 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=3
  20:18:21.695500 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=4
  20:18:21.845840 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=5
  20:18:22.007222 xid:cmd:saddr=0xb50c14b > daddr=0xffffffff,S=6,s=255,info=Palm III
  20:18:22.056143 snrm:cmd,ca=0xfe,pf=1
  20:18:22.056310 ua:rsp,ca=0xc8,pf=1
  20:18:22.056381 ua:rsp,ca=0xc8,pf=1

  37 pacckets received by filter
  ______________________________________________________________________



  4.3.7.  gnobex

  GNOME GUI for using the IrOBEX protocol, to connect to Palm III.



  4.3.8.  irkbd

  Support for infrared keyboard (and mouse?) protocol IrKBD.


  4.3.9.  irdalib

  Linux/IrDA library.


  4.3.10.  obex

  Please compile irdalib before compiling obex. Contains irobex_test,
  irobex_receive and irobex_palm3 . And obex_tcp which makes it possible
  to use OBEX over TCP/IP.


  5.  Configuration


  5.1.  General Configuration


  o  First you should put your IR devices in range. Though it might be
     possible that the Linux/IrDA service detects every new device
     automagically I only have good experience with the devices in range
     during the configuration process.

  o  Keep your infrared devices together in a range below one meter and
     an angle of 30 degree. There has to be a direct line of sight
     between them. If this is not possible, you may use a mirror (an
     unused M$ CD should work quite good).

  o  Add the following lines to your /etc/conf.modules file:

     ___________________________________________________________________
     # IrDA
     alias tty-ldisc-11 irtty
     alias char-major-161 ircomm-tty
     ___________________________________________________________________



  Note: The format of this entries has changed!

  Then do a depmod -a to update, and then ircomm should be automagically
  loaded when you need it. Here is what you need in /dev:


  dagbnb /usr/src/ > ll /dev/ir*
  crw-------   1 dagb     161,   0 Aug 25 20:13 /dev/ircomm0
  crw-rw-rw-   1 root     161,   1 Jun 18 13:44 /dev/ircomm1
  crw-rw-rw-   1 root     161,  16 Jun 18 13:44 /dev/irlpt0
  crw-rw-rw-   1 root     161,  17 Jun 18 13:44 /dev/irlpt1



  o  Have a look into the files in /etc/irda. They are similar to the
     files in /etc/pcmcia. Edit /etc/irda/drivers to reflect your setup.
     Most people will use irattach from that file. The files are:



     ___________________________________________________________________
     Makefile
     network*
     network.redhat*
     serial
     drivers
     network.opts
     obex
     printer
     ___________________________________________________________________



  o  Run depmod -a.


  5.2.  IrManager

  Dag Brattli wrote: " IrManager [...].is a user-space daemon that is
  inspired and quite similar to the cardmgr used in the PCMCIA
  distribution.

  The IrManager will receive events from the kernel level side of the
  protocol stack. When the IrManager receives an event it can execute
  shell commands and scripts, so I have added the /etc/irda directory
  which will contain such scripts. [...]

  For example, if IrLMP discovers a remote device with IrLAN provider
  capabilities and no local IrLAN client has registered, then IrLMP will
  send an event to the IrManager and make it "modprobe" the module
  required. [...]

  When application level clients are ready for communication and user-
  space configuration, they can also notify IrManager about this, so
  that it can execute the right script. For example IrLAN will send the
  event EVENT_IRLAN_START when the data channel is ready for exchanging
  Ethernet frames. When IrManager receives this event, it will execute
  /etc/irda/network start <devname> to configure the network interface.
  This network script is actually the same as used by the PCMCIA code
  and since I'm using the Redhat variant of it, it will in turn execute
  /sbin/ifup <devname>.

  So by using the IrManager, I "only" have to do this when I start the
  stack:

  ______________________________________________________________________
  irattach /dev/ttyS2 &
  irmanager -d 1           # -d 1 means: start discovery process
  ______________________________________________________________________


  and then when my laptop discovers the IrLAN provider (HP Netbeamer in
  my case) it will ask IrManager to load the module irlan_client. When
  the connection is up and ready, it will ask it to execute
  /etc/irda/network start eth0. When the connection is broken, it will
  again ask it to take down the interface using /etc/irda/network stop
  eth0.[...]

  That's all to get it working if you are using Redhat. If you are using
  some other distribution which doesn't have /sbin/ifup, then you better
  copy /etc/pcmcia/network.opts to /etc/irda/network.opts or configure
  the file yourself.

  If you want to use the IrLAN server, you will still have to modprobe
  irlan_server before you start the irmanager _without_ -d 1.

  And just like the cardmgr, you will (if you want to) get the beeps
  when the connection is up and running and when it is disconnected!!!

  I hope that we can add such scripts for all the other clients/services
  that need user level configuration. It would be really cool to have a
  /etc/irda/printer script for configuring IrDA(TM) capable printers. So
  if you get in range of an IrDA(TM) capable printer, then IrManager
  should load the irlpt_client module, and also configure the other
  stuff that needs to be done for using this printer.

  I also hope that we can use the config file for configuring IrDA(TM)
  ports and device drivers. Something like:

  ______________________________________________________________________
  Device Drivers
    module "irtty" script="irattach /dev/ttyS2"
    module "smc_ircc" irq=11 port=0x34f
  ______________________________________________________________________


  So that IrManager can load and start all these when it is executed. In
  this way we would only have to start IrManager in
  /etc/rc.d/init.d/irda and the rest would be plug and play. There would
  be no need for manually starting programs and configuring devices.
  When irmanager receives the following events for a device <dev> it
  will currently do:

  EVENT_IRLAN_START, start and configure the device using /sbin/ifup
  <dev>

  EVENT_IRLAN_STOP, close the device using /sbin/ifdown <dev>

  This can however be easily changed by the user, if this is not what is
  the prefered behaviour.

  5.3.  Low Level Drivers

  There are three sorts of low level drivers: SIR, dongle and FIR. If
  the right driver is detected by the kernel you get a message like:

  ______________________________________________________________________
  IrDA irda_device irda0 registered.
  ______________________________________________________________________



  5.3.1.  SIR


  o  Try to find out which serial port is used by the IR device. You may
     do so by watching the output of dmesg. If serial support is
     modularized do an insmod serial first. Look for an entry like:

     ___________________________________________________________________
     Serial driver version 4.25 with no serial options enabled
     ttyS00 at 0x03f8 (irq = 4) is a 16550A     #first serial port /dev/ttyS0
     ttyS01 at 0x3000 (irq = 10) is a 16550A    #e.g. infrared port
     ttyS02 at 0x0300 (irq = 3) is a 16550A     #e.g. PCMCIA modem port
     ___________________________________________________________________


  If this is not the case, you either don't have infrared support
  enabled in the BIOS or the SIR mode of your infrared device is not
  detected by the kernel. Currently I know only two laptop models with
  this effect, the HP OmniBook 800 and the Toshiba Libretto models. I am
  not sure whether PnP support effects the detection of the IR port. If
  you are unsure try it out and let me know the results. Maybe you can
  use FIR mode if SIR doesn't work.

  o  In some situations you may have to use setserial /dev/ttyS<0-2>
     port 0xNNNN irq M to set the values for your infrared serial port,
     especially if the infrared port is a separate serial line. You
     usually don't need to change the values! For further information
     look into the FAQ section below.

  o  If you don't use kerneld or kmod insert the irda module with
     modprobe irda.

  o  Do lsmod. It should show the modules irda and irtty now.

  o  A look into /var/log/messages should show the entry "Serial
     connection established" now.

  o  Say irmanager -d1, which will start the necessary programs, such as
     irattach.

  o  Give irattach some time, e.g. seven seconds, to detect other IR
     devices. Then watch the output from the kernel that you will
     hopefully get in /var/log/messages. It should look like the
     following (I removed some lines, which were not related to
     Linux/IrDA):

     Jan  2 12:57:26 japh kernel: ttyS00 at 0x03f8 (irq = 4) is a 16550A
     Jan  2 12:57:26 japh kernel: ttyS02 at 0x03e8 (irq = 4) is a 16550A
     Jan  2 12:57:26 japh kernel: Linux Support for the IrDA (tm) protocols (Dag Brattli)
     Jan  2 12:59:09 japh syslog: executing: 'echo 1 > /proc/sys/net/irda/discovery'
     Jan  2 12:59:09 japh syslog: Setting discovery to 1 exited with status 1
     Jan  2 12:59:09 japh syslog: + 0.1 Fri Jul 25 11:45:26 1997 Dag Brattli
     Jan  2 12:59:09 japh syslog: + 0.1 Fri Jul 25 11:45:26 1997 Dag Brattli
     Jan  2 12:59:09 japh syslog: Serial connection established.
     Jan  2 12:59:09 japh kernel: IrDA irda_device irda0 registered.
     Jan  2 13:01:22 japh syslog: executing: './drivers start '
     Jan  2 13:01:22 japh syslog: Serial connection established.
     Jan  2 13:01:42 japh syslogd: Printing partial message
     Jan  2 13:01:42 japh 0.1 Fri Jul 25 11:45:26 1997 Dag Brattli
     Jan  2 13:02:49 japh kernel: IrDA Discovered: japh
     Jan  2 13:02:49 japh kernel:     Services: Computer



  o  Even more information you can get with cat /proc/net/irda/discovery
     .


  5.3.2.  Dongle Connection - Infrared Adapters for the Serial Port

  The currently supported dongles are the Extended Systems Inc. ESI-9680
  JetEye, the Tekram IRmate 210B, the ACTiSYS IR220L and 220L+, the
  Greenwich GIrBIL.  dongle.

  Dag Brattli wrote (modified by wh): "To use dongles you have to do
  something like this:

  ______________________________________________________________________
  modprobe tekram         # or esi or actisys
  irmanager -d 1          #
  irattach -d tekram      # or -d esi or -d actisys
  ______________________________________________________________________



  As you can see, you must still use the -d option with irattach since
  it is possible to have two serial ports using different dongles at the
  same time (so the tty you are binding must know which dongle it is
  supposed to use). So if you have two dongles and two serial ports, you
  could do something like this:

  ______________________________________________________________________
  modprobe tekram
  modprobe esi
  irattach /dev/ttyS0 -d esi &
  irattach /dev/ttyS1 -d tekram &
  ______________________________________________________________________


  PS: I would not try to turn the two dongles against each other, since
  I really don't know how the stack would react :-) ...  Since I don't
  have any of these new ACTiSYS 220L+ dongles, I'm not able to test it.
  Since the new dongle has support for one extra speed (38400bps), you
  must specify the dongles differently with irattach so that the kernel
  knows which dongle you are using (and what QoS can be used):

  ______________________________________________________________________
  irattach /dev/ttyS0 -d actisys     # for the 220L dongle
  irattach /dev/ttyS0 -d actisys+    # for the 220L+ dongle
  ______________________________________________________________________


  The current implementation of dongle support does not have any state
  associated with it, so its not possible to use both ACTiSYS dongles
  (220L and 220L+) at the same time (connected to two serial ports) for
  now. If someone needs to be able to do so, please mail me (Dag Brat-
  tli) and I will think about it!"

  Note: When I tried to use an infrared modem (Swissmod 56Ki,
  manufactured by Telelink AG) connected to my laptop (IrDA works with
  Window$95 only, due to non standard hardware) I had to remove the
  infrared support in the BIOS to get it working!

  Dag Brattli: "It is now possible to use irport instead of irtty! I
  have moved all the dongle stuff out of irtty and into irda_device, so
  it will also be possible to attach dongles to irport. Need however to
  make a small user-space utility dongle_attach that can be used to
  attach dongles to a specific driver instance. BTW. irattach is still
  working as before, and you will not notice the difference even when
  attaching dongles to irtty (I've just redirected the dongle ioctl to
  irda_device). Irport may be interesting since you avoid one software
  interrupt (bh) level, and it's also forced to work in half duplex mode
  so you don't get any echo if the irda port itself don't have echo-
  cancellation (girbil dongle and HP-4000 etc) ... To use it, you must
  supply the parameters to insmod like this: insmod irport io=0x3f8
  irq=4, or whichever values you use. You can also add these parameters
  to /etc/conf.modules like this: options irport io=0x3f8 irq=4, but
  then you must remember to do a depmod -a and use modprobe irport
  instead of insmod."



  5.3.3.  Dongle Connection - Infrared Motherboard Adapter

  Support for the ACTiSYS IR2000 dongle has been implemented in a file
  called pc87108 which you can either compile into the kernel or
  insmod/modprobe to insert the module:



  ______________________________________________________________________
  irmanager -d 1
  modprobe pc87108
  ______________________________________________________________________


  or insert modprobe pc87108 into the /etc/irda/drivers file (I think).

  From James <james@esc.cam.ac.uk> I have this description about setting
  up the hardware: There are two configurations, a five pin in line
  connector and a 6 pin DIL (at the end of a 18 pin DIL header).
  Basically any IrDA conpatible transceiver will work (I have a stack of
  old IRM3001 these are now obselete) you need to hook a capacitor (use
  a tantalum about ~1uF) between 5V and 0V near the transceiver and then
  connect everthing else up (RX->RX, TX->TX, 5V->5V, and 0V-0V). If you
  don't like soldering irons, lots of companies do sell IR modules for
  the 5 pin connectors that fit into a hole in your case.


  5.3.4.  Fast InfraRed (FIR)

  The IrDA(TM) standard knows three kinds of speeds:


  1. SIR = Standard IrDA, up to 115kbps IrDA,

  2. MIR = Medium Speed IrDA,

  3. FIR = Fast IrDA (4Mbps),

  4. VFIR = Very Fast IrDA(16Mbps), seems to become a future standard

     Up to 115.200bps (SIR) many (probably all) infrared controllers
     work like a serial port and use a RZI (return to zero, inverted)
     modulation. Not every infrared controller supports 4Mps (FIR), up
     to 4Mbps they have to use 4PPM (4 pulse position) modulation
     technique. Currently there are two FIR chips supported:
     NationalSemiConductor NSC PC87108 e.g. used in IBM Thinkpad 560X
     and Winbond W83977AF (IR) FIR chip e.g. used in the Corel Netwinder
     PC. You may start the FIR service by loading the according module.
     Linux/IrDA will probe your hardware then. More drivers are under
     development.

  So what speeds can you expect? Using SIR, you should be able to get
  about 10 Kbytes/s. Using FIR (4Mbps) you can get over 300 Kbytes/s (if
  you are lucky).



  6.  Specific Connections and IrDA - Protocols


  6.1.  Printer Connection - IrLPT, IrTTP

  IrLPT support is under heavy construction at the moment. Maybe it will
  be replaced by IrCOMM. Please see mailing list archive.


  o  Remove any current print jobs with lprm "*".

  o  If you don't use kerneld do a modprobe irtty.

  o  Do a modprobe irlpt_client.

  o  Check the modules with lsmod. This should show: irda, irtty and
     irlpt_client
  o  cat /proc/misc. Gives you the minor device-number . It is the first
     number in the line with irlpt0.

  o  su to root, and do mknod /dev/irlpt0 c 10 <minor device-number>.
     Note: Something like ./MAKEDEV irlpt0 is not possible yet. But
     maybe load_misc irlpt works, though I couldn't test this yet.

  o  Try to write a small file to /dev/irlpt0 by cat FILE >/dev/irlpt0
     (do not wonder about a bad format this is just a first check). For
     me this didn't always work, but I couldn't find out why not.

  o  The better way is to change your /etc/printcap to use /dev/irlpt0
     in addition or instead of /dev/lp1. See Printing-HOWTO for detailed
     information.

  o  For easy printer setup you may use a printing software like
     APSFILTER, MagicFilter EZ-Magic (with RedHat there should also be a
     GUI for this purpose). Make a copy of /etc/printcap before.

  o  Example for APSFILTER with a HP 6P (non-postscript, HP 6MP is with
     postscript). The two relevant questions are:

     "Do you have a (s)serial or a (p)arallel printer interface?"
     Answer "p"

     "What's the device name for your parallel printer interface?"
     Answer "/dev/irlpt0"


  o  Restart the print daemon with kill -HUP <PID of lpd>. If you use
     another print daemon choose the according command.

  o  Watch whether the connection indicator of your printer shows
     activity, e.g. the green light above the IR port of a HP 6P/MP
     comes on (lower left hand corner, near the paper tray).

  o  I couldn't get to manage printjobs larger than approximately 10
     pages yet. But maybe this depends on the memory size of my
     hardware, which is 16MB. There seems to be a problem with the
     software too, Thomas Davis wrote: "I will ... limit the irlpt, so
     it won't eat memory when you send a large print file.".

  Takahide Higuchi reported: " I have been debugging IrCOMM with a
  printer ( Canon BJC-80v ) with IrDA port and IrCOMM protocol (not
  IrLPT). I can print a short e-mail text though, it easily causes dead
  lock when I try to print a postscript with gs."

  From the page of Thomas Davis http://www.jps.net/tadavis/irda
  <http://www.jps.net/tadavis/irda>: To use the IrLPT server, you need
  to perform the following steps:

  ______________________________________________________________________
  /sbin/insmod irlpt_server
  /sbin/mknod /dev/irlptd c 10 `grep irlptd /proc/misc|cut -f 1`
  ______________________________________________________________________


  At this point, the IrLPT server is ready to recieve print jobs; now;
  all you need is this simple shell script



  ______________________________________________________________________
  #/bin/sh
  #
  while (true)
  do
  cat /dev/irlptd | lpr
  done
  ______________________________________________________________________



  Dag Brattli: I hope that this will make it easier for all you that
  prefer to live in user-space, to make your own IrDA applications and
  try it out. Some printers actually use IrTTP (because of the
  limitations of IrLPT), so now you can write your own small user-space
  printer client so you can talk to it:



  ______________________________________________________________________
  int discover_devices(int fd)
  {
      struct irda_device_list *list;
      unsigned char buf[sizeof(struct irda_device_list) +
                        sizeof(struct irda_device_info) * MAX_DEVICES];
      int len;
      int daddr;
      int i;

      len = sizeof(struct irda_device_list) +
            sizeof(struct irda_device_info) * MAX_DEVICES;
      list = (struct irda_device_list *) buf;

      if (getsockopt(sfd, SOL_IRLMP, IRLMP_ENUMDEVICES, buf, &len)) {
          perror("getsockopt");
          exit(-1);
      }
      if (len > 0) {
          /*
           * Just pick the first one, but we should really ask the
           * user
           */
          daddr = list->dev[0].daddr;

          printf("Discovered: (list len=%d)\n", list->len);

          for (i=0;i<list->len;i++) {
              printf("  name:  %s\n", list->dev[i].info);
              printf("  daddr: %08x\n", list->dev[i].daddr);
              printf("  saddr: %08x\n", list->dev[i].saddr);
              printf("\n");
          }
      }
      return daddr;
  }

  void client()
  {
      struct sockaddr_irda peer;
      int addrlen = sizeof(struct sockaddr_irda);
      int daddr, actual;
      char buf[1024];

      fd = socket(AF_IRDA, SOCK_STREAM, 0);

      daddr = discover_devices(fd);

      peer.sir_family = AF_IRDA;
      strcpy(peer.sir_name, "P1284");
      peer.sir_addr = daddr;

      connect(fd, (struct sockaddr *) &daddr, sizeof(struct sockaddr_irda));

      /* Try to send something */
      actual = send(fd, "Testing", 8, 0);

      /* Try to read reply */
      actual = recv(fd, buf, 1024, 0);
  }
  ______________________________________________________________________



  6.2.  LAN Connection - IrLAN


  o  You might connect your Linux box using IrLAN to another network
     device such as a Linux box with IrLAn, a HP NetBeamer or a
     Window$95 box with Infrared Network Device support.


  o  Dag Brattli wrote: "If you want to use IrLAN you must modprobe
     irlan_client before ifup eth0. I had to remove the request_module()
     stuff since that needed a process context which I don't have in the
     kernel. "

     Maybe you have to choose the access mode. You can do this by using
     modprobe irlan access=1 for direct mode. IrLAN states that a
     provider can either be in direct mode, or in peer mode, so you
     currently have to choose when you start IrLAN.



  o  Run ifconfig eth0 up <ip_address> netmask <ip_netmask> to configure
     it with IP-address and other parameters. If the protocol is still
     running you may start communicating. It is possible to use RedHat's
     netcfg to do this, since it makes it very easy. Next time you only
     need to do /sbin/ifup eth0. Notice that ifconfig does not know how
     to deal with IrLAP addresses, so the address is really just the 4
     first bytes (in little endian format).


  o  Test the network device by pinging to it. For detailed information
     about further setup see the NET3-HOWTO.


  o  Do not forget to add a route, e.g. route add default gw
     <ip_gateway> or route add -host <target host> dev eth0.


  o  Ping to another IP now, to test the connection.


  o  For testing reasons I recommend only to use one laptop and one IR
     ethernet device in the same room. If there are problems look which
     different modes for the IR ethernet device are possible. Try them.

  For an ACTiSYS FIR board and dongle you may do:


  ______________________________________________________________________
  irmanager -d1
  /sbin/modprobe pc87108  # remove irattach from /etc/irda/drivers, or
                          # substitute irattach with the modprobe!
  ______________________________________________________________________



  On machine 1:

  ______________________________________________________________________
  modprobe irlan_client # not really necessary since irmanager should do this!
  ______________________________________________________________________


  On machine 2 (if you don't have an access-point)



  ______________________________________________________________________
  modprobe irlan_server
  ______________________________________________________________________



  Do not compile irlan_server into the kernel, since it currently does
  not like that! You should have configured /etc/sysconfig/network-
  scripts/ircfg-eth0 with a proper ad-hoc network if you are using two
  machines. If you have an access-point, then the normal setup should be
  fine.

  Notice that in the latest patch (2.2.0-irda1) irlan_client will call
  the device irlan0 by default, but you can change this by giving eth=1
  as an option to irlan_client (modprobe irlan_client eth=1 or options
  irlan_client eth=1 in /etc/conf.modules).  The next release of IrLAN
  will be only one module, so you don't need to think about if you need
  to have the client and/or the server installed.

  It's possible to do ifconfig irlan0 -broadcast to stop the AP from
  flooding you with broadcast frames! That can be a problem if you are
  connected to a very large Ethernet segment. The only problem is that
  your machine will then have to initiate all communications and can
  therefore not function as a server (well, you could probably make a
  stationary machine somewhere answer ARP requestes on your behalf).

  When using the IrLAN software from HP, you maybe have to name your
  computer "HP NetbeamIR" in the IAS entry to make it connect. Also I
  have heard rumors that a "Psion 3c" also wanted to connect only to
  another IR device if it had the same or a similar name.


  6.3.  HP NetBeamer Connection

  From Renaud Waldura: All the IrDA stuff is compiled in as modules.


  o  edited /etc/irda/drivers to include irattach /dev/ttyS0 (or
     whatever your "serial" IrDA port is, WH). Also /etc/conf.modules
     contains alias tty-ldisc-11 irtty.

  o  irmanager -d 1 then echo 3 >> /proc/sys/net/irda/debug to see
     what's going on.

  o  modprobe irlan

  o  I had to echo 9 >> /proc/sys/net/irda/slot_timeout (use 90 for
     newer kernels!)  in order to have the NetbeamIR recognized.
     Otherwise I was only getting a bunch of "media busy" messages, and
     no actual discovery of the NetbeamIR. 9 is the smallest value that
     worked for me.

  o  renamed /etc/irda/network.orig to /etc/irda/network and edited
     /etc/irda/network.opts for my IP config. Also copied
     /etc/pcmcia/shared to /etc/irda (this file is apparently missing
     from the distribution).

  o  I also had to comment out grep_stab $1 < /var/run/stab (line 131)
     in /etc/irda/shared. For some reason it fails, spitting a "usage"
     message.

  o  moved laptop in range, the NetbeamIR is discovered, irlan0 created
     and config'ed.

  o  transferred data at 7 kb/s, both ways: ping, ftp, telnet. Yaho!

  6.4.  Palm III Connection - IrOBEX

  The IrOBEX stuff seems under rapidly improving changing development.
  So the applications change, too. Therefore I just can't give quite
  exact information. Please see also the report by Dag Brattli at
  http://www.cdpubs.com/hhsys/archives/66/10brattl.pdf
  <http://www.cdpubs.com/hhsys/archives/66/10brattl.pdf> .

  Please note: IrOBEX now is in user-space and uses IrDA sockets.
  Remember that when using sockets, you don't need to have irobex
  enabled in the kernel, and /dev/irobex is not used anymore!The
  /etc/irda script is really only good for configuration of the devices,
  making the right mknod for /dev/irobex etc., not for starting
  applications.


  o  Palm III -> Linux

     1) Terminal 1> irattach /dev/ttyS<x>

     2) Terminal 2> load_misc irobex

     3) Terminal 3> Start irobex_app in the irobex directory. I suppose
     irobex_app is not working anymore. Now you should use the
     gtk/irobex program instead! You need to have the gtk library
     installed to use this program. A command line frontend should be
     programmed by someone. Maybe the programm to use is irobex_receive.

     4) Beam something from your Palm III.

     5) If everything is successful, you can take a look at a new file
     that has been created in the directory in which you started
     irobex_app (or in /tmp for irobex_receive). This file will be named
     after the object you just transfered.


  o  Linux -> Palm III

     This should also be possible, but I don't have any further
     information right now.


  o  PPP

     Rui Oliveira wrote: "This is just to let you know that with the
     latest IrCOMM patch (050998) of Takahide Higuchi, I managed to
     HotSync and establish a PPP connection between my Palm III and my
     Linux box. I'm using IRLink (from IsComplete) to redirect the
     serial port to ir. Communication with pilot-xfer (probably at
     http://www.slac.com/pilone/kpilot_home/mainpage.html
     <http://www.slac.com/pilone/kpilot_home/mainpage.html>) works
     flawlessly. Although I was able to establish a PPP connection, I'm
     still unable to fetch mail and do Web browsing. This is probably
     due to connection time-outs. I am checking this out. Please see the
     PPP-HOWTO for further information about PPP.

     ... I managed to establish an apparently robust connection between
     my Linux box and a Palm III. The pppd invocation I use is as
     follows:

     /usr/sbin/pppd /dev/irnine 57600 192.168.2.10:192.168.2.11 proxyarp
     passive silent persist noauth local nodetach. Over the PPP
     connection I used ping, ssh, and http.

     Strange is however the fact that discovery must be enabled
     (irmanager -d 1). Otherwise, even with an active IrCOMM connection,
     the link goes down due to a IrLAP disconnect.

     The pilot-link tools (used for Linux/Palm synchronization) also ran
     flawlessly over IrCOMM via /dev/irnine or /dev/ircomm."


  o  IrCOMM

     Jon Howell wrote: "I thought I'd try IrCOMM, since the Palm III can
     be made to reroute serial info to the IR port (using IrLink from
     IS/Complete, available at www.palmcentral.com), and then you can
     run a terminal program (like PalmTelnet in serial mode) over IrDA.
     I can only assume it's using the IrCOMM protocol. I've tested this
     configuration between two palm pilots, but of course I can't know
     what the protocol running over the IR is."

     (1) Start HotSync on your Palm. You need the IrDA upgrade for the
     Palm to have IrCOMM support
     http://www.palm.com/custsupp/downloads/irenhanc.html
     <http://www.palm.com/custsupp/downloads/irenhanc.html> .

     (2) Place the Palm in front of the dongle.

     (3) Start pilot-xfer -p /dev/irnine -s <sync-dir> .

     And if you are lucky it will start syncing. If you start pilot-xfer
     before you start HotSync on the pilot, you will _not_ be lucky!

     Maybe a terminal program like PalmTerm is also useful.


  Wessel de Roode wrote: The Palmpilot is default locked on 57k. You can
  however if you write your own software for the Pilot, use the 115k
  line settings. I quote a part from the irlib.h:

  ______________________________________________________________________
  ---------- irlib.h from the SDK 3.0 from palmpilot -----
  // Options values for IrOpen
  #define irOpenOptBackground     0x80000000              // Unsupported background task use
  #define irOpenOptSpeed115200    0x0000003F              // sets max negotiated baud rate
  #define irOpenOptSpeed57600     0x0000001F              // default is 57600
  #define irOpenOptSpeed9600      0x00000003
  -------------- end quote --------------------------------
  ______________________________________________________________________



  Peter Pregler reported: If the Palm enters the range of the irda-
  device a popup appears with the text "Transmission: waiting for
  sender"

  Ron Choy answered: There is a software called ShutupIR that is
  supposed to help with this problem of annoying popup
  http://hp.vector.co.jp/authors/VA005810/irda/shutup10.zip
  <http://hp.vector.co.jp/authors/VA005810/irda/shutup10.zip> I haven't
  tried it but it looks like it would fix your problem.


  6.5.  Palm III Connection to IBM Thinkpad 600

  This chapter is a courtesy of Harald Milz - SuSE. Minor changes by
  Werner Heuser to fit into the HOWTO.

  This document describes how to set up Linux/IrDA on an IBM Thinkpad
  600. This works for my machine. Your mileage may vary with other
  machines.
  6.5.1.  Prerequisites


  o  Reboot to the preinstalled M$ OS and activate the IR port using the
     Thinkpad tools. There is currently no Linux tool to achieve that.
     This will disable your internal serial port (ttyS0)!

  o  Reboot to Linux and configure a kernel with support for IrDA and
     IrCOMM. The Linux-IR-HOWTO talks about IrOBEX as well, but this is
     just for beaming objects across. This doesn't work with hotsync as
     far as I know (didn't try yet).


  6.5.2.  Adding support for IrDA



  o  Add the following lines to /etc/conf.modules:


     ___________________________________________________________________
     # IrDA
     alias tty-ldisc-11 irtty
     alias char-major-161 ircomm-tty
     ___________________________________________________________________



  o  Get the current IR Tools. I use version 0.9.2 at this time. Compile
     them proper. I installed irmanager and irattach in /usr/local/sbin
     (too lazy to make a RPM archive...).

  o  I modified /etc/irda/drivers and set up this /etc/rc.d/irda
     start/stop script. Don't forget to add the line START_IRDA=yes to
     /etc/rc.config and to add a symlink like /etc/rc.d/rd3.d/S99irda.

  o  Add a device file for the redirected IR device: mknod /dev/irnine c
     161 0 , see also /proc/tty/drivers.

  o  Add a symlink /dev/pilot --> /dev/irnine to make all programs happy
     (if you use the shell variable PILOTPORT=/dev/pilot).


  6.5.3.  Starting IrDA - First Steps

  Call /etc/rc.d/irda start and watch the console messages. ps should
  show irattach and irmanager running. Check /proc/net/irda to see what
  is there. ircomm will only be available and show reasonable stuff when
  an application accesses the irnine port (and loads ircomm_tty through
  kmod).

  Start PilotManager or sync-plan and be happy :-) IR should run fine at
  57600 bps.

  See SuSE Munich PalmIIIx pages
  <http://w3.muc.suse.de/links/palm.php3>, too.


  6.5.4.  Configuration Files


  /etc/irda/drivers:



  ______________________________________________________________________
  #! /bin/sh
  #
  # drivers
  #
  # Initialize and shutdown IrDA device drivers.
  #
  # This script should be invoked with two arguments.  The first is the
  # action to be taken, either "start", "stop", or "restart".
  #

  action=$1
  device=$2

  case "${action:?}" in
  start)
          /usr/local/sbin/irattach /dev/ttyS0          # The third serial port is an IrDA port
          # irattach /dev/ttyS0 -d esi # Attach a ESI dongle to the first serial port
          # irattach /dev/ttyS0 -d tekram
          # insmod pc87108             # If your machine as a pc87108 FIR chipset
          # modprobe uircc             # Sharp UIRCC chipset
      ;;
  stop)
          killall irattach             # ... or something. Currently not used
      ;;
  restart)
          /sbin/ifconfig ${device:?} down up
      ;;
  esac
  ______________________________________________________________________



  /etc/rc.d/irda



  ______________________________________________________________________
  #! /bin/sh
  # Copyright (c) 1995-1998 SuSE GmbH Nuernberg, Germany.
  #
  # Author: hm
  #
  # /sbin/init.d/irda
  #
  #   and symbolic its link
  #
  # /sbin/rc<skeleton>
  #

  . /etc/rc.config

  # Determine the base and follow a runlevel link name.
  base=${0##*/}
  link=${base#*[SK][0-9][0-9]}

  # Force execution if not called by a runlevel directory.
  test $link = $base && START_IRDA=yes
  test "$START_IRDA" = yes || exit 0

  # The echo return value for success (defined in /etc/rc.config).
  return=$rc_done
  case "$1" in
      start)
          echo -n "Starting service irda"
          ## Start daemon with startproc(8). If this fails
          ## the echo return value is set appropriate.

          startproc /usr/local/sbin/irattach /dev/ttyS0 || return=$rc_failed
          startproc /usr/local/sbin/irmanager -s1 -d0 || return=$rc_failed

          echo -e "$return"
          ;;
      stop)
          echo -n "Shutting down service irda"
          ## Stop daemon with killproc(8) and if this fails
          ## set echo the echo return value.

          killproc -TERM /usr/local/sbin/irmanager || return=$rc_failed
          killproc -TERM /usr/local/sbin/irattach || return=$rc_failed
          for i in ircomm_tty ircomm irtty irda ; do
                  rmmod $i;
          done

          echo -e "$return"
          ;;
      restart)
          ## If first returns OK call the second, if first or
          ## second command fails, set echo return value.
          $0 stop  &&  $0 start  ||  return=$rc_failed
          ;;
      reload)
          ## Choose ONE of the following two cases:

          ## First possibility: A few services accepts a signal
          ## to reread the (changed) configuration.

          #echo -n "Reload service foo"
          #killproc -HUP /usr/sbin/foo || return=$rc_failed
          #echo -e "$return"

          ## Exclusive possibility: Some services must be stopped
          ## and started to force a new load of the configuration.
          #$0 stop  &&  $0 start  ||  return=$rc_failed
          ;;
      status)
          echo -n "Checking for service foo: "
          ## Check status with checkproc(8), if process is running
          ## checkproc will return with exit status 0.

          #checkproc /usr/sbin/foo && echo OK || echo No process
          ;;
      probe)
          ## Optional: Probe for the necessity of a reload,
          ## give out the argument which is required for a reload.

          #test /etc/foo.conf -nt /var/run/foo.pid && echo reload
          ;;
      *)
          echo "Usage: $0 {start|stop|status|restart|reload[|probe]}"
          exit 1
          ;;
  esac

  # Inform the caller not only verbosely and set an exit status.
  test "$return" = "$rc_done" || exit 1
  exit 0
  ______________________________________________________________________



  6.6.  Psion 5 Connection

  Andrew Chadwick <andrew.chadwick@symbian.com> wrote: A nifty way to
  check that the baud rates for SIR are set up properly (if you have a
  Psion Series 5) is to point the S5 at your Linux box's IR window and
  try to beam a file. While the beamer dialog's on the screen, the S5
  will try to make an IrDA connection (even when it claims it can't find
  another IR machine). You should be able to do a cat < /dev/ttyS3 and
  if the serial parameters are right on both machines, you should see
  the words "Symbian EPOC" (machine ident) scroll past amidst the spew.

  Fons Botman wrote: " Maybe someone with a Psion 5 would like to test
  this program. It emulates the protocol for the Psion 5 IR send and
  receive command for files on linux. You can now exchange files with
  simple commands. The transfer rate is 9.7 KBytes/sec on a 115KB SIR
  link for big files which is not bad methinks. It is beta, so be sure
  to backup the Psion first, I did get a soft reset once (no data loss).
  ;-)" I have put the source into Appendix C.


  6.7.  Cellular Phone Connection

  As far as I know some cellular phones use the IrCOMM standard, e.g.
  Ericsson SH888 and NOKIA 6110 (I'm not sure about the NOKIA 8110).
  Maybe other cellular phones use the IrOBEX standard (see the Palm III
  section for information about setting up a connection) or IrMC.


  6.7.1.  Ericsson

  To start a communication session with /dev/irnine (/dev/ircomm), for
  instance, say:



  ______________________________________________________________________
  dip -t
  > port irnine
  > term
  ______________________________________________________________________


  Probably you may use cu or xc instead of dip, too (cu -l /dev/irnine
  or xc -l /dev/irnine). There are also reports about some efforts with
  the Ericsson GF768 and IR Modem DI 27.

  Benny Amorsen wrote: The SH888 emulates an IRDA-port when you connect
  it using the serial cable. Why someone would think up something weird
  like that is beyond me, but that is the way you get it to work in
  Windows. Not that I ever managed to make it work in Windows, though.

  Ales Dryak has send this survey (looks like a Debian/GNU Linux
  distribution, please modify your configuration accordingly). Mobile
  Ericsson SH888 (ati1 = 980408 1035 PRGCXC125101):


  1. mknod /dev/ircomm c 60 64

  2. /etc/conf.modules:

     ___________________________________________________________________
     alias tty-ldisc-11 irtty
     alias char-major-60 ircomm_tty
     ___________________________________________________________________



  3. /etc/irda/drivers: irattach /dev/ttyS0 # (IrDA port in SIR mode)

  4. running irmanager

  5. /etc/chatscripts/sh888

     ___________________________________________________________________
     <ABORT stuff>
     "" \d\d\d\d\d\dATZE0
     OK ATD<phone number to call)
     CONNECT \d\c
     ___________________________________________________________________



  6. /etc/ppp/peers/sh888


     ___________________________________________________________________
     noauth
     connect "/usr/sbin/chat -v -f /etc/chatscripts/sh888"
     /dev/ircomm
     115200
     defaultroute
     noipdefault
     user <your username> # don't forget to add your password to chap secrets or chat script
     ___________________________________________________________________



  A few seconds (app. 30) after executing pppd call sh888 I get
  connected to our Intranet/Internet having full IP connectivity
  (telnet, ftp, www, icmp tested). Futhermore I can connect to
  /dev/ircomm using minicom and play with AT command. Great! And looks
  stable!


  6.7.2.  NOKIA

  Carlos Vidal wrote: Correct me if I'm wrong, but it seems to me that
  Nokia telephones do not contain a genuine hardware modem, but
  something which is similar in principle to WinModems for PC. Whenever
  Nokia writes about modem communication, they use the name "Windows
  software modem" (or something similar). Which is actually backed up by
  the need to use special Nokia software for Windows (called Nokia
  Cellular Data Suite).

  Joonas Lehtinen wrote: This is true with 61xx models. Models: 8810,
  9000(i) and 9110 should work fine. (They have inbuilt modem). My Nokia
  9000 reports IrCOMM with linux.

  Some suggestion by Carlos Vidal carlos@tarkus.se : "I'm doing some
  tests trying to see how far can I get with my Nokia 6110 on Linux.
  I've just compiled gnokii-0.2.4 (gnokii is Nokia mobile phones
  connected via serial cable support for Linux and *BSD
  http://multivac.fatburen.org/gnokii/
  <http://multivac.fatburen.org/gnokii/> , WH), but it doesn't work. As
  I have Nokia Data Suite I did the following connection:

  Nokia 6110 <-- Nokia Cable --> PC/Linux <-- Null-modem cable -->
  PC/W95

  In the PC/Linux I run the program snooper (by Jun-ichiro itojun Itoh
  <itojun@mt.cs.keio.ac.jp>, sorry couldn't find an URL maybe some other
  sniffer will do it also, e.g. sniffit, see also appendiy about serial
  sniffers, WH) with small modifications in order to configure the
  serial port correctly.

  Normally, if snooper has the correct baud rate, the phone and the
  PC/W95 should communicate as if there was no snooper in between. This
  worked pretty well when I cracked the protocol of my Minolta camera.
  The problem here is that the phone doesn't answer or hangs after a
  while.

  It seems that the timing is quite important during the initial phase
  of the communication. The log I obtain is:


  ______________________________________________________________________
  0>1: UUUUUUUUUUUUUUUUUUUUUUUU
  line 0: LE *DTR *RTS ST SR CTS CD RI *DSR
  line 1: LE *DTR *RTS ST SR CTS CD RI *DSR
  0>1: UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
  UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
  UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU
  UUUUUUUUUUUUUUU\x1e\x00\x0c\x02\x00\x09\x00\x01\x00\x0d\x00\x00\x02\x01@\x00P\x
  06
  1>0: \x18\x00\x00\x00\xfc\x18\x00\x00\x00\x00\x00\x00\xc0\xf0
  0>1: \x1e\x00\x0c\x02\x00\x09\x00\x01\x00\x0d\x00\x00\x02\x01@\x00P\x06
  1>0: \x18\x00\x00\x00\x18\x00\x00\xc0\xf0\x18\x00\x00\x00\x00\x00\x00\xc0\xf0
  0>1: \x1e\x00\x0cd\x00\x06\x00\x01\x00\x10\x01`\x13\x13
  1>0: \x18\x00\x00\xf0\x00\x00\xfc
  0>1: \x1e\x00\x0cd\x00\x06\x00\x01\x00\x10\x01`\x13\x13
  ______________________________________________________________________



  0 is the PC/95 and 1 is the phone. The communication starts with a
  stream of 'U' (0x55) and with DSR/DTR on. The phone answers with '0x18
  0x00 ...'. This dialog continues for a while as if both were deaf and
  finally the phone crashes and the only way to reset it is to remove
  the batteries!

  I guess that what happens is that the phone is trying to find the
  correct baud-rate and fails because of the delays introduced by
  snooper. This probably has to do with some IrDA protocol used with
  also with the infrared connection."


  Wessel de Roode <J.W.deRoode@student.utwente.nl> "I manged to get the
  Discovery IR hint bits (with my Palm Pilot):


  ______________________________________________________________________
  Discover:
  0:xxxxxxxx:81.01
          01  IR_HINT_PNP     01  IR_HINT_TELEPHONY (IrMC ?)
          80  IR_HINT_EXT

  Device info query:
  \006Device\012DeviceName
          4e 6f 6b 69 61 20 36 31 30 30           Nokia 6100
  ______________________________________________________________________



  I also managed to query the PNP device of the Nokia. It has one PNP
  device. It's PNPC100 which equalt a 9600 baud modem. I deleted the
  query, if somene can send me a hint to restore it. was somthing like
  IrDA:<dunno>:PNP:Comp#01 The same query with IrDA:<dunno>:PNP:CompCnt
  gives the number of PNP-devices are available in the Nokia. Which is
  here only one."

  Maybe it is necessary to load the irlpt_server module for connections
  to a NOKIA.


  6.8.  Digital Camera Connection

  Markus Schill wrote: "Great that there are also other people who are
  interested in using the SONY DSC-F1 IR adapter under linux. Up to now
  I have only toyed around with the linux-irda software and the serial
  IR adapter from PuMa Technologies that came with the camera. This is
  the status. I am using linux 2.0.33 and the latest linux-irda...  If I
  use:

  ______________________________________________________________________
  insmod irda
  insmod irtty
  irattach /dev/cua0
  ______________________________________________________________________


  the adapter starts talking to the camera. /var/log/messages says that
  SONY-DSC-F1 was found, but no service is started. (Please note, this
  probably doesn't apply to the 2.2.x kernel versions of Linux/IrDA,
  wh).

  There are two programs for linux available that can be used for the
  communication with the camera via cable: (1) chotplay and (2)
  stillgrab. They both take a tty as commandline option, so I guess that
  they should work if the irtty layer of the protocol stack works
  correctly ... I have not looked at anything in the linux-irda code,
  yet!). I am not sure whether I understand the stack but shouldn't the
  irtty make the thing look like a normal tty? What service should be
  started. "
  Dag Brattli wrote: "I'm not sure which application level protocol the
  camera uses, but it is possible that it implements the IrDA(TM)
  Infrared Transfer Picture Specification (IrTran-P). If you take a look
  at http://www.irda.org/standards/pubs/IrTran-P_10.pdf
  <http://www.irda.org/standards/pubs/IrTran-P_10.pdf>, you will see
  that it is a protocol which is implemented above IrCOMM (not IrTTY!).
  IrTTY is something we use just to be able to talk to the Linux serial
  driver. "


  6.9.  Window$9x/NT and Linux/IrDA


  6.9.1.  Introduction

  Why this? Unfortunately Linux users are not always supported with the
  necessary hardware information. Sometimes it is possible to look at
  this informations in Window$95. Sometimes its even useful to connect
  the two. Linux could also provide occasional access point services to
  a Window95 laptop of a friend dropping by.

  Where to get it from? At
  http://www.microsoft.com/windows95/info/irda.htm
  <http://www.microsoft.com/windows95/info/irda.htm> you will find a
  support pack "Infrared Transfer 2.0". It is a self-extracting archive
  W95IR.EXE with 331KB. Note: MicroSoft seems to change the location of
  this file (and others) at random.

  Microsoft(tm) has three versions of IrDA support for Windows95. The
  version number can be found in the "Software" icon in the Control
  Panel and the file infrared.inf.

  Version 1.0 is still delivered with some hardware.

  Version 2.0 is the version they currently offer at their web site. It
  is in the self-extracting file W95IR.EXE. The last time I looked
  (1999-02-21) it was 434KB and was found at
  http://support.microsoft.com/download/support/mslfiles/W95IR.EXE .
  Their website is frequently changing, so do not be surprised to find
  the file (also) in another location or not at all.

  Version 3.0 can/could be found in their downloadable Infrared
  development kit IRDDK30, but is mostly useful for developers. It is
  internally different from 2.0, it is based on "miniport" network
  drivers, just like the Linux version. It exists for some time and has
  some support for NT, but it clearly did not make it into the
  mainstream NT4.0 distributions. For 95 you are probably better off
  with 2.0. The choice may depend on the documentation of the drivers
  you get with your specific hardware.

  MS website also used to contain a nice utility IrXfer, contained in
  the archive IRXFER.EXE, This is the Infrared Transfer utility, which
  uses an IrOBEX variant I think, it is referenced in the IrOBEX
  protocol description. The utility was freely downloadable, but I could
  not find it the last time. It is a nice graphical utility which can be
  used to transfer files over IrDA between computers.

  With some machines, e.g. a HP Omnibook 800 it is necessary to use a
  vendor specific version of this package (for the HP Omnibook 800 you
  may find it on the recovery CD).

  Especially the ..\windows\inf\*.inf files and the device manager are
  of interest to look for configuration details.

  As far as I know Window$NT doesn't support IrDA(TM). About Window$98 I
  have heard there is no IrDA(TM) support yet. Countersys on
  http://www.countersys.com <http://www.countersys.com> claims to sell
  an IrDA solution for NT4.0 to support their JetBeam product, Microsoft
  refers to them for it.

  AFAIK:

  o  Windows95   : use 2.0

  o  Windows98   : delivered with 3.0 and IrXfer (works with Linux/IrDA,
     IrOBEX?)

  o  WindowsNT4.0: no IrDA

  o  Windows2000 : 3.0(+?) http://www.microsoft.com/hwdev/infrared/

  There are also some non M$ products available. Note: Some of them use
  proprietary infrared protocols:


  o  CounterPoint: QuickBeam 1.15 (works with Linux/IrDA, IrOBEX?)

  o  LapLink 7.5

  o  CarbonCopy 32 4.0

  o  pc ANYWHERE 7.5

  o  Puma Technology: TRANXIT pro 4.0


  6.9.2.  Connection between Linux/IrDA and Window$95 IrDA(TM)

  I suppose there are four ways to connect Linux/IrDA and Window$95:

  1) A network connection between two PC's. If you have set up Infrared
  Transfer 2.0, you will find an IrDA(TM) network device in the <Network
  Device Section>. But I couldn't get a working connection yet.

  Some information by Fons Botman: MS does not support PEER mode, which
  is strange, because it would fit their workgroup model. I have had
  success with IrLAN DIRECT mode when I removed the COMPUTER entry in
  the hints bits from the Linux side. Windows95 will recognise the Linux
  box as a lan access point and will try to install a driver for it but
  cannot find it. At this point I install the network adapter driver
  named Microsoft IrDA Lan Driver (you can also do this beforehand). You
  now should have a new active network driver which can be seen with
  WINIPCFG. To make it work with TCPIP I give the linux side an address
  using the redhat configuration tools and start a dhcp server on the
  linux box which hands out leases on the IrDA subnet. Sometimes I have
  to use WINIPCFG to explicitly ask for a lease. After this you can
  freely network between the two computers. Try to telnet or use
  explorer from Windows95 to linux.

  Open points:

  a. write a proper /etc/sysconfig/network/irlan-up script.

  b. solve the direct/peer mode problem and the peer mode dhcp problem
  (zero, one, too many dhcp servers on the irda sublan), maybe borrow
  leases from a dhcpserver on the eth0 lan (dhcrelay).

  c. Make the Microsoft IrDA Lan Driver install automatically, maybe
  this is a problem in the PnP configuration. This seemed to work better
  on Windows98.


  d. I sometimes get a TCP configuration problem after disconnect, which
  can be solved by a Windows95 reboot. Maybe tune the dhcp
  configuration.

  2) Maybe it is also possible to use the IrOBEX protocol. But I don't
  know which software to use and where to get it. I supposed the
  necessary software comes with a Palm III, but this seems not to be
  true.

  3) Takahide Higuchi <thiguchi@pluto.dti.ne.jp> provided IrCOMM
  support. From his page at http://www.pluto.dti.ne.jp/~thiguchi/irda/
  <http://www.pluto.dti.ne.jp/~thiguchi/irda/> I have taken the
  following description (I have modified it at little): "With IrCOMM
  support you can send or receive short messages between a linux box and
  a terminal program on a win95 laptop! Please add this line to
  /etc/conf.modules:

  ______________________________________________________________________
  alias char-major-60 ircomm_tty
  ______________________________________________________________________


  Next, make a device file mknod /dev/irnine c 161 0. Now Linux/IrDA
  services can be started as usual with irattach /dev/ttyS? &.
  /dev/irnine can be used as a serial device. ircomm and ircomm_tty mod-
  ules will be loaded automatically by kerneld/kmod when a program uses
  /dev/irnine. NOTE: I think "setserial" utility will not work on
  /dev/irnine. Tips:

  o  To accept login via IrCOMM, use this as a root: First, please
     enable IrDA and IrCOMM. Then edit /etc/inittab and add a line like
     this:

     ___________________________________________________________________
     T1:23:respawn:/sbin/getty -L -w irnine 38400 vt100
     ___________________________________________________________________


  and do this as a root: init q. And init will start waiting for incom-
  ing IrCOMM connection. You will see your favorite Linux's login prompt
  from terminal emulator on Win95!

  o  If you try pppd, please consider the -crtscts option to disable
     flow-control. I implemented some flow-control emulation but it is
     not tested.

  o  Now my patch reports what kind of features is needed by the peer
     infrared device. Messages like this will be written in syslog:

     Sep 4 10:01:02 monolith kernel: parse_control:instruction(0x12)
     Sep 4 10:01:02 monolith kernel: data:03



  o  I especially want to know what message SH888 (or other infrared
     devices except for win95 PC) says. So please mail me your syslog
     generated during IrCOMM connection! If you have a copy of the
     IrCOMM specification written by IrDA(TM), please see page 34 or 38,
     and you will know what these messages mean."

  4) From Fons Botman: IrLPT works fine. Make Linux the IrLPT server,
  and in Windows95 configure a printer to use the virtual LPT port
  defined when you installed MS-IrDA. Windows95 periodically sends some
  short sequence to the printer, I still have to figure out what that
  is.

  6.10.  Linux to Linux Connection


  6.10.1.  Connection Methods

  There should be three ways to get two Linux machines connected via
  Linux/IrDA.

  o  Dag Brattli wrote about the IrOBEX support: "The awakened reader
     may wonder what prevents the beaming of files from Linux to Linux?
     Well, nothing!! (but I haven't tried that yet). This means that we
     now have a "simple" way of beaming files between Linux laptops. I
     think that this may be the "killer app" we all have been waiting
     for!" Try to "load_misc irobex at both ends, and then try
     iroabex_app get on one of the machines and irobex put <file> on the
     other.".

  o  Via Linux/IrDA network connection. I suppose you have to load the
     module irlan_client at one machine and irlan_server at the other
     one.

  o  With IrCOMM support, in other words over a serial line, which could
     mean minicom, pppd, etc. If you want just now to use IrCOMM between
     Linux boxes, please add this line to /etc/conf.modules of _one_
     box:


     ___________________________________________________________________
     # set ircomm protocol engine to client-only mode
     options ircomm ircomm_cs=1
     ___________________________________________________________________



  Note: Don't add it to both boxes, or they cannot accept incoming con-
  nection each other! But since 2.2.7 there's no need to add options
  ircomm ircomm_cs=1 to /etc/conf.modules anymore. Please remove it if
  you are using it.


  6.10.2.  Compression

  Please note this feature is still quite experimental! Dag Brattli
  wrote: "Just wanted you to know I have just added COMPRESSION support
  to IrLAP! As you may know, this is _not_ part of the IrDA(TM)
  standard, but Linux can now negotiate with its peer and check if it
  has the same compression capabilities). So obviously if you are
  talking to Win95, Palm III or whatever, you will _not_ get
  compression!!! This is something which is exclusive for Linux as far
  as I know! The IrDA(TM) standard says that devices should ignore
  unknown field in the negotiation header, so we are still "compatible"
  with IrDA(TM) (have just borrowed an unused header value).

  If you want to try using the compression code (Linux <-> Linux) you
  will have to insert the irda_deflate module some time before you
  actually make the connection. I do it before irattach.

  The compression standard I have added is the deflate format used by
  the zlib library which is described by RFCs (Request for Comments)
  1950 to 1952 in the files ftp://ds.internic.net/rfc/rfc1950.txt (zlib
  format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).

  The compression interface is similar to PPP, so you can add as many
  different compressors as you want. Currently there is only support for
  GZIP, but BSD compression will be added later.  ...  Have just tested
  GZIP compression at 4Mbps. It was a really bad idea! Compressing the
  frames takes so much time that the performance is actually worse than
  when not using compression at all. The conclusion is that compression
  should only be used for SIR speeds, ..."



  6.11.  Multiple Instances

  Dag Brattli wrote: "The IrLAP layer has been enhanced to allow more
  than one instance (so I can use IrLAN on my built-in ir-port, and
  communicate with the Pilot over the IrDA dongle at the same time) ...
  So how do you make two Linux/IrDA connections? Well, you just fire up
  irattach for each of the IR ports you have like this:

  ______________________________________________________________________
  irattach /dev/ttyS0 &    (my ESI dongle)
  irattach /dev/ttyS2 &    (my builtin IrDA port)

  insmod irlan_client
  insmod irobex
  ______________________________________________________________________



  They will not see each other if you run them on the same machine,
  since they will initiate discovery exactly at the same time. You
  should however be able to use them against two other laptops. I can
  run a dongle, builtin IrDA port and a IrDA pcmcia card at the same
  time with three other IrDA devices without any problems.

  You should notice that if the devices can interfere with each other
  then it might be difficult to obtain a connection, since a device is
  not allowed to transmit if the media is busy. I sometimes have to put
  a book between them."


  6.12.  Connection to Docking Station

  Dag Brattli: "Connection to the Tekram IRDocking IR-660
  http://www.tekram.com/Hot_Products.asp?Product=IR-660
  <http://www.tekram.com/Hot_Products.asp?Product=IR-660> . This device
  is a docking station with LAN access, printer, mouse and keyboard. You
  can also use them at the same time as the internal mouse and keyboard!
  Just fire up gpm -t ps2 /dev/irkbd and the laptop will make a
  keyboard/mouse connection to the IR-660. Now I just have to make gpm
  read both /dev/psaux and /dev/irkbd, and then make X11 read
  /dev/gpmdata, and I should have the thing configured!

  ... one problem: gpm can handle multiple mice, but Linux cannot handle
  multiple different keyboards. So if you have one norwegian keyboard
  and one remote US keyboard like I have, then things will be a little
  bit confusing. I got a hint from Alan Cox about a project that is
  implementing real support for multiple keyboards, so I'll check that
  out.

  ... OK, I sort of worked it out. By using TIOCSTI on /dev/console, you
  can insert scancodes directly into the tty queue. This can be a
  problem for virtual consoles that expect to receive some translated
  and cooked keycodes, but X happens to like raw scancodes, so this will
  work quite nice when using X but not for other virtual consoles.
  Anyway this is good enough for me, so I will not use a lot of time
  converting the scancodes to keycodes and index them with some keymap
  just to make it work with text only virtual consoles. As I see it the
  irkbd driver has now been successfully been ported to user-space :-)


  ... the Tekram IR-660 device can, in addition to attach a keyboard and
  mouse, also print using IrTTP (it can print using IrLPT, but that is
  not so funny since it requires exclusive use of IrLMP, and you don't
  wan't to stop the network, mouse and keyboard just to print a
  document). I'll try and see if I can get IrTTP printing working using
  a fifo as well.

  ... Tekram has added a control channel in addition to the data channel
  so that you can get some status information about what is going on.
  The name of their own protocol is P1248. It's published through the
  "P1248" class and "IrDA:TinyTP:LsapSel" LM-IAS entry, so you can try
  to find it.

  ... Canon is using the P1248 protocol, and their printer monitor
  program BrintBuddy2 (Japanese version) is using this protocol now. I
  don't know what they use for the data channel. Maybe they support
  TinyTP directly in addition to the other methods. You can try and look
  up the "IrLPT" class with the "IrDA:TinyTP:LsapSel" in the LM-IAS and
  see if you can find it."


  6.13.  Connection to Keyboard

  The Linux/IrDA keyboard driver is now in user-space. Please see
  chapter Connection to Docking Station above.

  Lichen Wang: "The so called IrDA-D standard is designed to transfer
  Data. It is not suitable for IR Keyboard. IrDA-D is what Dag ported to
  Linux OS and what MS ported to Windows OS.

  The so called IrDA-C (Control) is designed for Keyboard, Joy-stick,
  etc. I am not aware that there is any product in the market that is
  using it yet.

  IrDA-D cannot talk to IrDA-C. IrDA-C cannot talk to IrDA-D either.
  Both the physical encoding/decoding and the software protocol are very
  different.

  It is possible to implement both IrDA-D and IrDA-C in the same device.
  Sharp says that IrDA-D and IrDA-C can coexist -- as long as both of
  them are not used at the same time in the same IR space. This sounds
  rather funny to me. According to this definition, anything can co-
  exist with anything as long as you do not destroy the universe
  permanently in the process ;-)

  Seriously, what SHARP says is that they can tailor the IrDA-D so that
  there are some unused time between the negotiated maximum turnaround
  time and the actual transmission. They then squeeze the IrDA-C frames
  in those unused time. The IrDA-D Primary and IrDA-C Master must be
  implemented in the same device. The keyboards will work, but mice and
  joysticks may be sluggish at times."


  6.14.  Connection via Serial Cable

  For some reasons it may be useful to connect via serial cable instead
  of using a real infrared link. Bjorn Hanson wrote: "Using a cable, I
  managed to get a PPP connection through my Ericsson SH888. I did the
  following (maybe some steps are wrong but they worked for me :-)

  o  added alias tty-ldisc-11 irtty to /etc/conf.modules

  o  edited /etc/irda/drivers to irattach /dev/ttyS0

  o  manually inserted the irda and irtty modules using insmod

  o  started irmanager -d1

  o  run kppp using /dev/irnine (through symlink /dev/modem)

  o  executed stty < /dev/irnine

  o  ping thehost

  o  ifconfig irda0 down

     Everything worked fine for ping and ssh (doing ls -l a couple of
     times) but the computer hang when I tried to mail (Netscape) this
     through that PPP. After reboot I tried both Netscape and lynx. Both
     were able to establish contact but none got any data."

  Another way by Claudiu Costin <claudiuc@calderon.pcnet.ro>:

  o  Linux 2.2.5 with IrDA compiled as modules

  o  Because irattach don't make kernel to load automatically IrDA
     stack, let's type modprobe actisys<

  o  Now, irattach /dev/ttyS1 -d actisys where COM2 is used for null
     link

  o  irmanager

  o  ping <address> work very good!

     This has to be done for both machines.

  Please note this is not the recommended stuff to connect two machines.
  Use PPP instead. Though I cannot see how this approach is useful I
  have included it beause it was asked sometimes in the mailing list.


  6.15.  Peer-to-Peer Mode / Direct Mode

  IrCOMM and IrLAN work in both modes, but currently I don't have
  further information about the differences between these modes and how
  to set them up.



  7.  Hardware Supported by Linux/IrDA


  7.1.  Obtaining Information about the Infrared Port in Laptops

  To get the IrDA port of your laptop working with Linux/IrDA you may
  use StandardInfraRed (SIR) or FastInfraRed (FIR).


  7.1.1.  SIR

  Up to 115.200bps, the infrared port emulates a serial port like the
  16550A UART. This will be detected by the kernel serial driver at boot
  time, or when you load the serial module. If infrared support is
  enabled in the BIOS, for most laptops you will get a kernel message
  like:



  ______________________________________________________________________
  Serial driver version 4.25 with no serial options enabled
  ttyS00 at 0x03f8 (irq = 4) is a 16550A     #first serial port /dev/ttyS0
  ttyS01 at 0x3000 (irq = 10) is a 16550A    #e.g. infrared port
  ttyS02 at 0x0300 (irq = 3) is a 16550A     #e.g. PCMCIA modem port
  ______________________________________________________________________



  7.1.2.  FIR

  If you want to use up to 4Mbps, your machine has to be equipped with a
  certain FIR chip. You need a certain Linux/IrDA driver to support this
  chip. Therefore you need exact information about the FIR chip. You may
  get this information in one of the following ways:


  1. Read the specification of the machine, though it is very rare that
     you will find enough and reliable information there.

  2. Try to find out wether the FIR chip is a PCI device. Do a cat
     /proc/pci . The according files for 2.2.x kernels are in
     /proc/bus/pci . Though often the PCI information is incomplete. You
     may find the latest information about PCI devices and vendor
     numbers in the kernel documentation usually in
     /usr/src/linux/Documentation or at the page of Craig Hart
     http://members.hyperlink.net.au/~chart
     <http://members.hyperlink.net.au/~chart> . From kernel 2.1.82 on,
     you may use lspci from the pci-utils package, too.

  3. Use the DOS tool CTPCI330.EXE provided in ZIP format by the German
     computer magazine CT ftp://www.heise.de/pub/ct/ctsi/ctpci330.zip
     <ftp://www.heise.de/pub/ct/ctsi/ctpci330.zip> . The information
     provided by this program is sometimes better than that provided by
     the Linux tools.

  4. Try to get information about Plug-and-Play (PnP) devices. Though I
     didn't use them for this purpose yet, the isapnp tools, could be
     useful. At the page from Craig Hart I found this PNP IDs:


     ___________________________________________________________________
     IBM0002   IBM Thinkpad Infrared Port
     IBM0034   IBM Thinkpad Infrared Port
     PNP0510   Generic IRDA-compatible device
     PNP8294   IrDA Infrared NDIS driver (Microsoft-supplied)
     PNP8389   Peer IrLAN infrared driver (Microsoft-supplied)
     ___________________________________________________________________



  5. If you are running Linux-2.3.x and PCMCIA-CS-3.1.x, turn on the PnP
     BIOS in PCMCIA-CS. Then, do a lspnp -v (from Thomas Davis).

  6. If you have installed the Linux/IrDA software load the FIR modules
     and watch the output of dmesg, whether FIR is detected or not.

  7. Another way how to figure it out explained by Thomas Davis
     (modified by WH): "Dig through the FTP site of the vendor, find the
     Windows9x FIR drivers, and they have (for a SMC chip):



     ___________________________________________________________________
     -rw-rw-r--   1 ratbert  ratbert       743 Apr  3  1997 smcirlap.inf
     -rw-rw-r--   1 ratbert  ratbert     17021 Mar 24  1997 smcirlap.vxd
     -rw-rw-r--   1 ratbert  ratbert      1903 Jul 18  1997 smcser.inf
     -rw-rw-r--   1 ratbert  ratbert     31350 Jun  7  1997 smcser.vxd
     ___________________________________________________________________



  If in doubt, always look for the .inf/.vxd drivers for Windows95. Win-
  dows95 doesn't ship with _ANY_ FIR drivers. (they are all third party,
  mostly from Counterpoint, who was assimilated by ESI)."

  8. Also Thomas Davis found a package of small DOS utilities made by
     SMC. Look at http://www.smsc.com/ftppub/chips/appnote/ir_utils.zip
     <http://www.smsc.com/ftppub/chips/appnote/ir_utils.zip> . The
     package contains FINDCHIP.EXE. And includes a FIRSETUP.EXE utility
     that is supposed to be able to set all values except the chip
     address. Furthermore it contains BIOSDUMP.EXE, which produces this
     output:

     Example 1 (from a COMPAQ Armada 1592DT)


     ___________________________________________________________________
          In current devNode:
                Size      = 78
                Handle    = 14
                ID        = 0x1105D041 = 'PNP0511' -- Generic IrDA SIR
                Types:  Base = 0x07, Sub = 0x00,  Interface = 0x02
                     Comm. Device, RS-232, 16550-compatible
                Attribute = 0x80
                     CAN be disabled
                     CAN be configured
                     BOTH Static & Dynamic configuration
           Allocated Resource Descriptor Block TAG's:
                TAG=0x47, Length=7 I/O Tag, 16-bit Decode
                                        Min=0x03E8, Max=0x03E8
                                        Align=0x00, Range=0x08
                TAG=0x22, Length=2 IRQ Tag, Mask=0x0010
                TAG=0x79, Length=1 END Tag, Data=0x2F
     ___________________________________________________________________



  Result 1:

  Irq Tag, Mask (bit mapped - ) = 0x0010 = 0000 0000 0000 0001 0000 so,
  it's IRQ 4. (start at 0, count up ..), so this is a SIR only device,
  at IRQ=4, IO=x03e8.


  Example 2 (from an unknown machine)



  ______________________________________________________________________
       In current devNode:
            Size      = 529
            Handle    = 14
            ID        = 0x10F0A34D = 'SMCF010' -- SMC IrCC
            Types:  Base = 0x07, Sub = 0x00,  Interface = 0x02
                 Comm. Device, RS-232, 16550-compatible
            Attribute = 0x80
                 CAN be disabled
                 CAN be configured
                 BOTH Static & Dynamic configuration

       Allocated Resource Descriptor Block TAG's:
            TAG=0x47, Length=7 I/O Tag, 16-bit Decode
                                    Min=0x02F8, Max=0x02F8
                                    Align=0x00, Range=0x08
            TAG=0x22, Length=2 IRQ Tag, Mask=0x0008
            TAG=0x47, Length=7 I/O Tag, 16-bit Decode
                                    Min=0x02E8, Max=0x02E8
                                    Align=0x00, Range=0x08
            TAG=0x2A, Length=2 DMA Tag, Mask=0x02, Info=0x08
            TAG=0x79, Length=1 END Tag, Data=0x00
  ______________________________________________________________________



  Result 2:

  a) it's a SMC IrCC chip

  b) one portion is at 0x02f8, has an io-extent of 8 bytes; irq = 3

  c) another portion is at 0x02e8, io-extent of 8 bytes; dma = 1 (0x02
  =0000 0010)


  Thomas Davis has placed some device information at
  http://www.jps.net/tadavis/irda/devids.txt
  <http://www.jps.net/tadavis/irda/devids.txt> .

  WARNING: The package is not intended for the end user, and some of the
  utilities could be harmful. The only documentation in the package is
  in M$ Word format. Linux users may read this with catdoc, available at
  http://www.fe.msk.ru/~vitus/catdoc/
  <http://www.fe.msk.ru/~vitus/catdoc/> .


  9. Use the Device Manager of Windows9x/NT or WINMSD (Windows NT
     Diagnostics) in Windows NT 4.0, WINMSD is quite useful, and a bit
     more informative than Windows9x's Device Manager.

  10.
     You may also use the hardware surveys mentioned below.

  11.
     And as a last ressort, you may even open the laptop and look at the
     writings at the chipsets itselfs. Here is an probably incomplete
     list of manufacturers: Chrystal, Hewlett Packard (HP, chipsets are
     marked HSDL), Hitachi, IBM, National Semi Conductor (NSC), NEC,
     Philips, Sharp, Standard Micro Systems Corporation (SMC/SMSC),
     Texas Instruments (TI), VLSI, Winbond. As an example of application
     circuits the HSDL-7001 (from a HP brochure, modified by WH):



     ___________________________________________________________________
         LEDs        Encode/Decode        SIR/FIR

        HSDL-1001    HSDL-7001          UART 16550/
                                       MicroController
        ______      ______________      ____________
       |      |    |              |    |            |
     (||   TXD|<---|IR_TXD     TXD|<---|SOUT        |
       |      |    |              |    |            |
       |      |    |           RCV|--->|SIN         |
       |      |    |              |    |            |
     (||   RCV|--->|IR_RCV  16XCLK|<---|BAUDOUT     |
       |      |    |          NRST|-+  |            |
        ------      --------------  |   ------------
                                    V
     ___________________________________________________________________



  7.2.  Big Endian

  Though the source is build to work with big endian machines, I didn't
  get any reports about actually using it. It would be interesting if
  it's actually working or not. You will probably need an IrDA dongle or
  something to test it.

  i386 and alpha are little endian, arm can choose (but the NetWinder
  has been wired as a little endian machine). m68k, sparc and ppc are
  big-endian! mips can choose I think. If unsure, look in
  /usr/src/linux/asm/byteorder.h and check if it includes
  <linux/byteorder/big_endian.h> or <linux/byteorder/little_endian.h> .


  7.3.  SMP

  Dag Brattli: "The problem ... has not been analyzed yet. It may be
  unsafe, and it may work pretty well. All upstream traffic should be
  safe (bh's), but downstream traffic _may_ be dangerous. I really don't
  know. ... All list operations irqueue.c in Linux-IrDA is currently SMP
  safe!". Please check the source code for the current status.


  7.4.  Hardware Surveys

  There are some surveys about Linux and infrared capable devices in the
  WWW:


  o  The Linux/IrDA Project - Hardware Survey at
     http://www.cs.uit.no/linux-irda/hardware.html
     <http://www.cs.uit.no/linux-irda/hardware.html>

  o  Takahide Higuchi at
     http://www.pluto.dti.ne.jp/~thiguchi/ir/product.html
     <http://www.pluto.dti.ne.jp/~thiguchi/ir/product.html>.This page is
     in japanese.

  o  I have also set up a hardware survey at
     http://www.snafu.de/~wehe/index_li.html
     <http://www.snafu.de/~wehe/index_li.html>. This list also contains
     information about infrared capable devices which are not mentioned
     here (mice, printers, remote control, transceivers, etc.).

     To make this hardware survey list more valuable it is necessary to
     collect more information about the infrared devices in different
     hardware. You can help by sending me a short e-mail containing the
     exact name of the hardware you have and which type of infrared
     controller is used.

     Please let me also know how well Linux/IrDA worked, at which tty,
     port and interrupt it works and the corresponding infrared device
     (e.g. printer, cellular phone) you use.

     You can also help by contributing detailed technological
     information about some infrared devices, which is necessary to
     develope an according driver for Linux.



  8.  Graphical User Interface (GUI)

  Currently there are two graphical user interfaces for Linux/IrDA under
  development:


  8.1.  GNOBEX

  A GNOME application developed by Dag Brattli
  http://www.cs.uit.no/linux-irda/irda.html <http://www.cs.uit.no/linux-
  irda/irda.html> with support for drag'n drop from the GNOME file
  manager gmc. It will also show the progress of the file transfer and
  give some better error messages when something goes wrong. The GUI
  isn't finished yet, but if you want to try the GUI you will need the
  Perl-GTK+ module.

  Annotations about CORBA by Dag Brattli: I have just had the first
  successful test running ORBit/CORBA over IrDA sockets/IrTTP! ORBit is
  btw. the GNU CORBA implementation used by the GNOME project. The goal
  is to make it possible for GNOME applications to work between your
  laptop and your stationary PC without having to first set up a TCP/IP
  link. Applications on the laptop can then make use of CORBA exported
  services on your stationary machine.

  IrDA (as a one hop technology) fits nicely into the network hierarchy
  since ORBit will now choose which profile to use in this order:


  1. Same process (same address space), Some short circut mechanism is
     used that I don't know much about. It should however be nearly as
     fast as a procedure call.

  2. Same machine (different address space), UNIX domain sockets are
     used

  3. One hop away, IrDA is used (if IrDA is available and a ORBit/CORBA
     capable device is discovered)

  4. Multiple hops away (if all other methods fails). IIOP, TCP/IP will
     be used.

  I use my laptop and a NetWinder for testing. The machines are
  connected by both Ethernet and IrDA. It's really nice to start a CORBA
  session and see that the IrDA does discovery, IAS-query, and connects
  if a CORBA capable device is discovered. If somethings goes wrong,
  IIOP (TCP/IP) will automagically be used instead. When the transaction
  if finished, the link goes down again."

  There is also OBEX support to the gnome-calendar application gncal.
  Just click on an event and beam it to your Palm Pilot! Still needs to
  do some cleanup, and support for beaming the other way as well.

  8.2.  KDE

  A KDE application developed by Thomas Davis. Look at his page
  http://www.jps.net/tadavis/irda <http://www.jps.net/tadavis/irda>.

  Here's your chance to contribute! Both GUI's need some icons. Any
  icons need to be:


  o  each of them should display a printer, PC, PDA, LAN connection,
     etc.

  o  the format is not really important, but PNG is what will be used in
     the end

  o  set size (48x48 pixels seems to be a common size, I think)

  o  large and mini (ask about size for that; mini's are for docking and
     such)

  o  16 colors

  o  free for use

  o  please, don't blatently copy MS icons!

  Please contact the developers.


  9.  Power Saving

  In the specifications of my HP OmniBook 800 it is recommended to turn
  off the IR port, if it is not in use, because it may consume up to 10
  percent of the battery time.

  If necessary, you may also try to disable the Fast RRs feature in the
  IrDA section of the kernel. This option will give you much better
  latencies but will consume more power.



  10.  Beyond IrDA


  10.1.  Extending Transmission Distance

  According to the IrDA specification the range is up to 1 meter. From
  the "IrDA Data Link Design Guide" p. 20 by Hewlett-Packard
  http://www.hp.com/go/ir <http://www.hp.com/go/ir> : " In some cases it
  may be desired to increase link distance beyond the 1 meter guaranteed
  by IrDA. The two ways to do this are to increase transmitted light
  intensity, or to increase receiver sensitivity. In order to extend the
  link distance, both sensitivity and intensity must be increased for
  both ends of the IR link. If it is desired to communicate with a
  standard IrDA device that may have minimum transmitter intensity, the
  receiver intensity must be increased. The standard IrDA device may
  also have minimum receiver sensitivity, so transmitter intensity must
  also be increased."

  Andreas Butz wrote: "This might be a silly question, but has anyone an
  idea whether the whole IrDA stack really relies on a two-way
  connection, or whether there are some parts of it that could be abused
  for a one-way connection, ideally for unreliable data? We're trying to
  modify some IR dongles to broadcast information to palm pilots over
  several meters distance (cover a whole room), and since we don't want
  to modify the pilots themselves, and increasing the sensitivity on the
  receiver side seems unlikely to work, we're stuck with a one way
  link.". Please see the mailing list archive for details of the
  discussion.

  Sent by Marc Bury <Marc.Bury@NETGEM.com> " .. just heard about some
  Philips new scheme for remote controls: they call it IRDA - Control.
  This is supposed to be bi-directional, 75 kbps data rate, multiple
  simultaneous devices (up to 8) and with a minimum 6 meter range!" More
  information at   http://www.irda.org/ <http://www.irda.org/> .

  The german magazine ELEKTOR issued a guide to build a Long Distance
  IrDA Dongle (20m, RS232, IrDA 1.0), ELEKTOR 5/97 p.
  http://www.elektor.de <http://www.elektor.de> .

  <tzeruch@ceddec.com>: The main problem is that you generally have to
  make the receiver more sensitive. Basic physics has the inverse square
  law: the intensity drops with the SQUARE of the distance, so going
  from 1 to 5 meters requires 25x the power (and battery drain on a
  portable device), or 25x the sensitivity (and dynamic range - it still
  has to be able to work at 3 inches).  And if you want to do it on the
  other end, it doesn't simply have to be 25x more sensitive, it must
  pick up the tiny IrDA pulse needle in a haystack of florescent lights,
  screen savers, moving shadows ...

  Someone tried it with a Palm III upgrade board  http://home.t-
  online.de/home/PSPilot/ppppiii.htm  <http://home.t-
  online.de/home/PSPilot/ppppiii.htm> .

  Also laser diodes (pulsable) were recommended by K-H.Eischer: But they
  are more expensive. And the laser diodes are also dangerous if they
  have more than 1 mW. A better solution would be to use lenses to focus
  the beam. There is a minimum of absorbtion in the air (I don't know
  the right frequency) and you should use IR diodes with this frequency.

  James wrote: " Who ever it was wanting to do long distance with IrDA,
  we've tried this before. The best approaches are:

  o  wavelan - buy the cards but not the antennas you can make your own
     with equaly good gain as the $9000 type they sell here.

  o  microwave - you can pick up X-band doppler radar modules, tune them
     slightly apart and use the your local TX as the LO for the
     incomming RX, the whole thing behaves like ethernet and you can
     hook it onto an AUI port, this may now be illegal.

  o  ir - Many people sell kits which transmit video over Ir, they come
     complete with the large fresnel lense you need, they manage about
     4MHz b/w over 100m.

  o  laser diodes - when we looked at these they were a pain, I think
     elantec make decent drivers but modulating them was a big pain,
     Steve Carcia had a series on articles on modulating He-Ne lasers
     but be careful they have lots of volts in them that want to get out
     and kill you.

     Whatever you choose IrDA might very well be a good choice for a
     protocol, given it's one of the few that sensibly copes with
     simplex."


  10.2.  Upcoming Standards (Bluetooth and IrDA)

  "More and more people now think that IrDA and Bluetooth will live
  happily side by side, and the idea of Bluetooth as the IrDA killer
  just don't work anymore. IrDA is still unbeatable in price/performance
  and with the new additions to the standards family like AIR and VFIR,
  it's really good to see that IrDA is moving in the right direction."


  11.  Troubleshooting, Mailing List


  11.1.  General Information

  If you encounter problems. Try the following:


  o  Read the FAQ section below.

  o  Look at /var/log/messages and/or /var/log/kern.

  o  Do a dmesg.

  o  Look at the different files in /proc/irda.

  o  Look at the mailing list archivs, whether your problem is already
     known. Since August 1999 it the archiv is located at Linux-IrDA
     mailing list archiv
     <http://www.pasta.cs.UiT.No/mailman/listinfo/linux-irda>. All mails
     before are archived at
     http://www.ita.chalmers.se/~svinto/hypermail/irda/
     <http://www.ita.chalmers.se/~svinto/hypermail/irda/> .

  o  As a last ressort ask in the Linux-IrDA mailing list. You may
     subscribe at Linux-IrDA mailing list
     <http://www.pasta.cs.UiT.No/mailman/listinfo/linux-irda> . You are
     welcome to use this mailing list for posting questions, answers,
     bug-reports, patches, suggestions and comments. It would be much
     easier to help you if you provide some information. Please include:


     ___________________________________________________________________
     uname -a
     cat /proc/net/irda/irlan
     cat /proc/net/irda/irlap
     irdadump
     ___________________________________________________________________



  o  There is also a new IrDA related mailing-list. This list is driven
     by Dag Brattli and the Pasta project, and is intended for
     discussion about IrDA protcols, setups, configurations, devices,
     and problems that users and developers might have and want to
     discuss with others. So this is ment to be a much more general list
     than the Linux-IrDA list. You can find the list at: Linux-IrDA list
     <http://www.pasta.cs.uit.no/mailman/listinfo/irda/>. Archives can
     be found at: Linux-IrDA list archiv
     <http://www.pasta.cs.uit.no/pipermail/irda> . From Dag Brattlis
     announcement: Though "IrDA is already running a public (but web-
     only) mailing-list, and I hope it's OK that we run these two lists
     in parallel. I'm not trying to have any competition ;-) but my
     intentions are purely to make it easier for users and developers to
     publicly discuss IrDA related (and non-Linux specific) issues with
     each other. I have named the list IrDA <irda@pasta.cs.uit.no> since
     it's about IrDA, so I hope this is OK for IrDA. If you visit the
     list, you will see that I have choosen to call it: IrDA -- The
     Pasta Projects Unofficial IrDA Forum.



  11.2.  Troubleshooting Techniques

  Although I'm not much of a hacker I collected some tricks to track
  errors or bugs in the Linux/IrDA software.


  o  You may set the debug level in /proc/sys/net/irda/debug to 1, 2, 3,
     4.

  o  Use the files in /proc/sys/net/irda to try different parameters
     like echo 0 > /proc/sys/net/irda/discovery.

     The /proc/*/irda files are:

     ___________________________________________________________________
     root@duckman:~# ls /proc/sys/net/irda/* /proc/net/irda/*
     /proc/net/irda/discovery        /proc/net/irda/irlmp            /proc/sys/net/irda/devname
     /proc/net/irda/irda_device      /proc/net/irda/irttp            /proc/sys/net/irda/discovery
     /proc/net/irda/irias            /proc/sys/net/irda/compression
     /proc/net/irda/irlap            /proc/sys/net/irda/debug
     ___________________________________________________________________



  o  It is also possible to debug the code. But I don't know how to do
     this. If you want to use SKB debug code, you may edit irda.h and
     change /include/linux/skbuff.h (see revision history of snapshot
     10-2-98).

  o  For problems with the irda module a utility from the modules
     package kdstat might be helpful. But I was not able to try this.

  o  "You can now alter the number of discovery packets used (1, 6, 8 or
     16) and the timeout between sending them (2-8 * 10 ms) in
     /proc/sys/net/irda. Please experiment if you have problems
     discovering your device. My Palm III seems to like 16
     discovery_slots and 8 (*10 ms) for slot_timeout. " ... "The
     absolute minimum for reliable discovery of the IR-610 seems to be
     9."

     Another statement: ... the Palm III does not like 8 discovery
     frames in a row, but 6 is OK. With 8 it will answer 1 out of 6-10
     times, with 6 it answers every time. I really don't know if this is
     a problem with Linux-IrDA or the Palm III. One solution to this
     problem, is to cycle though some different discovery methods for
     each discovery like this:

     Disocvery 1: send 8 xid frames with 80 ms separation

     If answer, keep the same config, if no answer, try next config

     Discovery 2: send 6 xid frames with 80 ms separation

     Discovery 3: send 8 xid frames with 90 ms separation

     Discovery 4: send 6 xid frames with 90 ms separation

     Discovery 5. Go back to 1.

     or some other pattern and maybe more combinations.

     Maybe this is sometimes implemented, so it would be enabled if
     /proc/sys/net/irda/discovery_slots is set to 0 .



  o  If anybody gets a kernel Oops, then please feed it to the
     ../linux/scripts/ksymoops/ksymoops program, so that we can find out
     where it went wrong. Just cut out the Oops lines from the syslog,
     save them to a file, and then run ksymoops <file>

  o  Dag Brattli wrote: I found out that the cs4232 sound card was
     giving me several hundred interrupts per second! I removed the
     sound stuff from my kernel, and the machine is now generally about
     4 times faster!

     Linux/IrDA may get problems if you are running the esound server
     (esd) on your machine. Both my machines, a 166Mhz Pentium laptop
     and a 200Mhz Pentium Pro cannot run Linux/IrDA when esd is running.
     The reason is that esd makes the soundcard give interrups over 300
     times/second which makes the serial driver overrun when receiving.
     This is because the serial driver now uses slow interrupts in
     Linux-2.2 (everything is slow interrupts in 2.2), so the interrupt-
     handler schedules on its way out. The good thing about slow
     interrupts is that packets are delivered much faster, since you
     don't need to wait for the next timer-tick. The only exception for
     this is the pc87108 driver which works fine since it uses DMA and
     will only give a couple of interrupts per packet.

  o  There are also some userspace tools irdaping and irdadump to check
     Linux/IrDA connections.

  o  AFAIK it is possible to use IrCOMM either with an infrared device
     or via serial cable. Maybe this give some debugging possibilities,
     too.

  o  1) You may edit /etc/conf.modules, adding the following lines:

     ___________________________________________________________________
     option irda irda_debug=3
     option irlpt_client_debug=3 irlpt_common_debug=3
     ___________________________________________________________________



  2) Make sure the irda modules have been totally removed.

  3) Edit /etc/syslog.conf, adding the following lines:

  ______________________________________________________________________
  */*                     -/var/log/all
  ______________________________________________________________________



  4) Do killall -1 syslogd .

  5) Print, or do whatever causes problems with irlpt .

  6) Check all the files in /var/log/ .



  12.  IrDA Network Neighborhood


  12.1.  Laptop-Printer-PDA

  You can take a little peek at http://www.cs.uit.no/linux-
  irda/snapshots/ircc.gif <http://www.cs.uit.no/linux-
  irda/snapshots/ircc.gif> Drag-n-drop stuff, so you will be able to
  drop files to your PDA (uses IrOBEX) or drop files to your printer
  (uses IrLPT) etc.


  12.2.  Bridging/Routing

  James wrote: " ... there is a much better way of doing the briding
  which is routing. This is entirely user land and requires no kernel
  patches.

  It's in two parts (you may only need one your milage may vary...) the
  first called irdaipcfg does the following:

  1) First part is executed as irdaipcfg ifeth ifirlan daemonizes, then
  looks for ARP packets on ifirlan, checks that the arp was not
  generated by the machine on which it is running. The arp contains the
  ip address of the machine on the other end of the irlan (it was
  generated by the gratuatous arp in the irlan code). The program then
  sets up a host route to this ip address via ifirlan, adds a proxy arp
  to ifeth for it and generates a gratuatous arp on ifeth. It writes the
  ip address of the client in /var/run/host.ifirlan so you can easily
  undo all of this from a script.

  2) Second part is executed as gratarp ifirlan. Sometimes the
  gratuatous arp seems to get lost in the pipe work, gratarp deamonizes
  and spits out a whole stream of the things...

  I use them as follows: (you can use them to do whatever you like)

  On my host (the machine bolted to my local net) irlanx is brought up
  as 10.192.0.1 with a netmask of 255.255.255.255 and a broadcast of
  10.192.0.1 by my ifup script from /etc/irda/network by irmanager.
  /etc/irda/network then runs irdaipcfg eth0 irlanx and this does the
  routing.

  From /etc/irda/network

  ______________________________________________________________________
  "start")
          echo 1 >/proc/sys/net/ipv4/conf/all/forwarding
          ./ifup ifcfg-${device}
          /sbin/irdaipcfg ${localnet} ${device}
      ;;
  "stop")
          host=`cat /var/run/host.${device}`
          if [ .$host != . ]; then
            /sbin/arp -d ${host} dev ${localnet}
            /sbin/route delete ${host} dev ${device}
          fi
          ./ifdown ifcfg-${device}
          /sbin/ifconfig ${device} down
      ;;
  ______________________________________________________________________



  on the client I set up irlan to use an address on my normal subnet
  10.32.32.51 but with netmask 255.255.255.255 (not my usual netmask) I
  have some static routes which are host 10.192.0.1 dev irlan, and net
  default gw 10.192.0.1 dev irlan. I run gratarp from the
  /etc/irda/network, and I can wander arround my house and not lose
  telnet and ssh sessions ... they are sitting in
  ftp://bullard.esc.cam.ac.uk/pub/irda
  <ftp://bullard.esc.cam.ac.uk/pub/irda> "


  12.3.  IPv6

  AFAIK IPv6 has neighbor discovery mechanismem, but I don't have
  information about Linux/IrDA used with IPv6. Please see the mailing
  list archive for a discussion of this topic under the subject
  :"patch-2.2.7-ac1-irda4" .


  12.4.  DHCP

  I have got reports that it is possible to use dhcpcd with IrLAN.
  Please use latest DHCP software.


  13.  Linux/IrDA and APM

  Fons Botman wrote: "When I hibernate my HP OmniBook 2000CT, (Fn-12
  diskimage is written to disk, machine turns off completely) with irtty
  active and turn it on again, irda does not work. I can see it trying
  to reply to discovery frames it receives from a windows box, using
  irdadump on the OmniBook. but the windows PC does not see the replies.
  If I just kill irattach and remove irtty and serial, and start
  irattach again, it starts working again. Does this occur with other
  linux laptops also? Is it a problem in the serial device driver? "
  Also Pedro Figueiredo reported this problem for a Fujitsu LifeBook
  735DX.

  Answer by Dag Brattli: "Could you all check if the same thing is
  happening when your're using PPP (and not using IrDA). I guess the APM
  stuff shuts down the serial port, so that the driver will need to
  reinitialize it when waking up again. This is properly implemented by
  some of the PCMCIA drivers I know about, but I really don't think the
  serial driver gets any events from the APM system.

  So here you have your own little kernel project. Start adding APM
  support to irport which will be the easiest thing (and also to the FIR
  drivers), then you can start adding a patch to the serial driver (if
  needed). Again I think the PCMCIA subsystem may be a good source on
  how to fix it properly."


  14.  Known Bugs

  If you find a bug, please send a bug report to the mailing list,
  including dmesg output, and which Linux version, and hardware you are
  using. Thank you!

  Sometimes IrCOMM fails to connect (especially when both devices
  discover each other. You can disable discovering with echo 0
  >/proc/sys/net/irda/discovery)

  A CR (carriage return) character cannot be transfered between two
  linux boxes via IrCOMM with cat file >/dev/irnine and cat /dev/irnine.
  It causes a strange thing and freezes your Linux box.  Compiling the
  pc87108 device driver non modular crashes the kernel on boot.
  Temporary solution: compile the driver as a module

  IrOBEX may eat some data on receive. The bug is most probably in the
  user-space side of IrOBEX.



  15.  FAQ



  o  Q1 - Question: I do not know anything about ports and irqs. What
     should I do?

  o  Answer:


     PART A: Hardware settings

     - 1  Have a look at your hardware specs!!! If not available look at
     the support page of your vendor, or contact the support hotline.
     You might also find the information in one of the hardware surveys
     mentioned above.

     - 2  Use a current BIOS. Usually available at the support page of
     your vendor.

     - 3  Try setserial /dev/ttyS? -g -a | egrep 16550A. One of the
     shown devices is probably the one you are looking for. Usually it
     is the second one, but with no guarantee.

     - 4  Note: What seems like an UART is physically the IrDA
     controller. For my HP Omnibook 800 this is the VLSI VL82C147 PCI -
     IrDA controller. These controllers should behave up to 115 200 bps
     like UART's. But sometimes it is very difficult to get the right
     configuration.

     PART B: How to tell the kernel about the hardware settings

     -4  cat /dev/ioports to see which ports are already in use.

     -5  cat /dev/interrupts to see which interrupts are already in use.

     -6  Make ports and interrupts available for use with the IR device,
     e.g. stop the pcmcia service or include a line like this in
     /etc/sysconfig/pcmcia: PCIC_OPTS="irq_list=3,4,5,7,9,10,12,14,15"

     -7  Now try to guess what the right interrupt and port is. Use
     setserial /dev/ttySx irq M port 0xNNNN to tell the kernel. If there
     is more then one possible chance try them all (Note: As mentioned
     in the Serial-HOWTO you should not try irq 0, 1, 6, 8, 13, 14).

     -8  If you were successful please send the useful parameters to the
     author, because I would like to include them in the hardware
     survey.

     -9  Good luck.

     It might also be necessary to fine tune the IR serial port with
     setserial, e.g., setserial /dev/ttyS0 spd_vhi (speed rate 115200).



  o  Q2 - Question: For me, irattach hangs, but recognizes the printer.
     /var/log/messages shows that irattach found my HP LaserJet 6P.

  o  Answer: The "hang" is normal for irattach. Everything is working
     right if you see the HP Laserjet show up in the log. "hang" means
     irattach is polling the IrDA-Devices for incoming connections. If
     you kill it with <CTRL C> the irattach program crashes and
     /dev/ttySx does not work anymore. The problem is within the irda
     module, and not with the irattach program. Rebooting is the only
     thing to do! Next time put irattach in the background by using
     irattach &. Stop it if necessary with killall irattach.
     Recommendation by Andreas Butz: To my knowledge, <CTRL Z> bg should
     work, too, but I haven't tried it in this specific case. Normally
     it has the exact same effect as appending & to a command.
  o  Q3 - Question: I get a message like tcsetattr read/write error in
     /var/log/messages.

  o  Answer: Caused probably by wrong /dev/ttyS* or wrong irq or port.


  o  Q4 - Question: Every setting seems alright, because I get the
     appropriate messages. But it still does not work.

  o  Answer: Move the devices to within 0.5 meter (1.5 feet). Check that
     only one application is using the infrared port. Check that both
     devices are using the same protocol, such as IrOBEX or IrCOMM.


  o  Q5 - Question: I have downloaded the latest snapshot, and compiled
     it successfully under Linux 2.0.33 running on an IBM Thinkpad 560E.
     In the absence of any other IrDA machines to test with, is it safe
     to assume that once the module has been inserted and the syslog
     reports "irattach: Serial connection established.", is the IR
     really working, and will it start to respond once there is another
     machine with which to talk?

  o  Answer by Dag Brattli: Sorry, this only means that irattach has
     done its part of the job, which is just to start the irda-tty.
     Maybe the message should have been different, but as I said, it
     tells that the serial connection between the irda-chip and the
     irda-driver is established.

     Note: Support for IrDA on 2.0.x kernels has been discontinued. You
     are encouraged to switch to 2.2.x kernels and use the newest IrDA
     patches available at http://www.cs.uit.no/linux-irda/snapshots/
     <http://www.cs.uit.no/linux-irda/snapshots/>.


  o  Q6 - Question: At startup modprobe -a checks /lib/modules/<KERNEL-
     VERSION>/net/irda.o and causes the messages: "IrLAP; Missing IrTTY
     /IrLMP Error no IrLAP connection" (in /var/log/messages and on the
     console).

  o  Answer by Werner Heuser: Workaround for SYSTEM V style systems: Put
     a script named for example "ir_rmmod" containing


       ______________________________________________________________________
       #!/bin/sh
       echo "$0 : remove irda module"
       rmmod irport.o
       rmmod irtty.o
       rmmod irda.o
       ______________________________________________________________________



  in the startup process (/etc/init.d and a symbolic link name for exam-
  ple "S100ir_rmmod" in /etc/rc3.d to "ir_rmmod"). (Verify the path for
  "sh"). For BSD style systems try the corresponding approach.


  o  Q7 - Question by Ho Chin Keong: Is there other way of setting up
     communication between the 2 laptops besides setting up a LAN route
     between the two?

  o  Answer by Dag Brattli: Yes and no! One of the IrDA standard, IrCOMM
     permits you to emulate a serial cable between two laptops, so you
     can use any application written for serial ports (terminals, PPP,
     slip, etc.). This is however not yet implemented in Linux/IrDA. The
     IrLPT (printer) support is actually a subset of IrCOMM, so some of
     it is working!


  o  Q8 - Question by Ho Chin Keong: If I block the infrared path
     deliberately for more than 10 seconds, the connection could not re-
     establish. I have to kill the irattach and restart the whole
     procedure to start the infrared route. The connection could be
     maintained, however, if the blocking is less than 10 seconds. Is
     this part of the design or a bug? Is there any way whereby we can
     lengthen this time limit from 10 s to longer or infinitely?

  o  Answer by Thomas Davis: This seems to be a bug in the primary side
     of the IrLAP/IrLMP code. It appears not to send the
     reset/disconnect notice all the way back up the stack. You'll
     notice it when IrLPT gets stuck in the query mode while you were
     trying to talk to a printer, and disconnected/interrupted it when
     it was handshaking. (and now, it shows up in the IrLAN portion)


  o  Q9 - Pierre-Guillaume Raverdy asked: Should I update to IR lib on
     my palm and update the system to version 3.0.2?

  o  Answer by Dag Brattli: You should not need to update your Pilot,
     but it should not do any harm to do so. It is however required if
     you want to use the IrCOMM library from IsComplete


  o  Q10 - Pierre-Guillaume Raverdy asked: Also any simple source code
     (especially on the palm side) would be greatly appreciated.

  o  Answer by Dag Brattli: Get the Pilot SDK from Palm. Unzip the
     examples.zip and take a look at the beamer application.


  o  Q11 - Is there any IrDA support for BSD?

  o  Answer: Linux/IrDA seems to be the only available GPL source yet.


  o  Q12 - By Rui Oliveira: I am having a problem connecting a PalmIII
     to a Linux box with an Actisys 220L adapter. With a motherboard
     adapter (no brand but, I think, similar to the Actisys 210L) I
     simply redirect a pilot syncronization tool (pilot-xfer) to
     /dev/ttyS1 which has the ir adapter attached and, using IrLink in
     SIR mode, I can get the Linux box to talk with the PalmIII. Trying
     the above through a serial port with a serial-irda Actisys 220L
     adapter I can't get this to work. My question is :What happens if
     one just throws data into a serial port with a irda adapter?

  o  Answer by Lichen Wang: In terms of hardware, IrDA SIR needs a
     serializer- deserializer, an encoder-decoder, and a transceiver.
     The UART that drives the COM port of any PC is a serializer-
     deserializer. In some PC, there is also an encoder-decoder which
     can be enabled or disabled by the BIOS. When it is disabled, the
     COM port is usable as an old COM port. When the encoder-decoder is
     enabled, usually the COM port is no longer usable but an IrDA port
     is now usable instead.

     Actisys IR-210 is a SIR transceiver and thus can be used if the PC
     has this kind of UART with an IrDA encoder-decoder and the BIOS has
     enabled it. Under this hardware configuration, you need to tell the
     Windows setup program that you have "standard infrared devices" and
     with "Built-in Infrared port on laptop or desktop".

     Actisys IR-220, on the other hand, includes both the encoder-
     decoder and the transceiver. It is designed to be used with a
     regular UART. If the UART in the PC has also the encoder-decoder
     built-in, you must use BIOS to disable that. Under either of this
     hardware configuration, you need to tell the Windows setup program
     that you have an "ACTiSYS" manufactured "ACT-IR220L Infrared
     Wireless Interface".

     To answer your question: In addition to throwing data at the serial
     port, you need to tell the UART and the encoder-decoder what data
     rate to use. In the case of a built-in encoder-decoder, when you
     set the data rate of the UART, the encoder-decode also get set
     correctly. In the case a separate encoder-decoder, you need to tell
     both of them the data rate separatly.

  o  Q13 - If I try to make a connection, say telnet, it takes an
     incredibly long time for the login prompt to appear.

  o  Answers by Renaud Baldura, Dag Brattli and Hee Thong: ... it's a
     DNS problem. The resolver times out trying to reverse-resolve the
     IP address of your incoming connection. I think just renaming
     /etc/resolv.conf to something else takes care of it. ... or add
     some static bindings in /etc/hosts for the machines you want to
     access in your ad-hoc network. That should avoid the DNS lookups.
     ... If both machines are in a private test environment, put the
     following line in the /etc/host.conf, order hosts, bind. This will
     make the machine check the /etc/host file before doing a DNS
     lookup. Remember to update the host file on both machines to
     reflect the IP and host names of the 2 machines.

  o  Q14 - Question by David LaPorte: I was wondering if anyone has had
     any success getting the irda port on the Toshiba Tecra 740cdt
     working. ... I've read that it should show up at IRQ 11, ttyS2.
     Well, I have a PCMCIA modem which steals ttyS2 and the PCMCIA
     controller steals IRQ 11. Does anyone have any suggestions?

  o  Answer by Dag Brattli: If you still have Win95 on your machine, you
     should go to the device manager and change the PnP setup for the
     IrDA port (something else than the stuff your're already using).
     You could for example move away ttyS1 (in Win95), so that it uses
     the values that the PCMCIA card is going to steal, and then use the
     settings from ttyS1 for ttyS2.


     ___________________________________________________________________
     dagbnb ~/linux/test/ > cat /etc/sysconfig/pcmcia
     PCMCIA=yes
     PCIC=i82365
     PCIC_OPTS="irq_list=7,9,10"
     CORE_OPTS=
     ___________________________________________________________________


  ... should make sure the PCMCIA controller stays away from irq 11.
  Also make sure that the IrDA port is enabled in Win95 since it's dis-
  abled by default.



  16.  Infrared Remote Control


  16.1.  Resources

  Remote control via infrared is not the aim of the Linux/IrDA project
  but is included in this HOWTO to cover "Linux and Infrared" more
  completely. I found three projects which worked on this topic. You may
  find some links to current information at http://
  www.snafu.de/~wehe/index_li.html <http://
  www.snafu.de/~wehe/index_li.html>.

  o  LInux Remote Control - LIRC

     LIRC is a package that supports receiving and sending IR signals of
     the most common IR remote controls. It contains a device driver for
     hardware connected to the serial port, a daemon that decodes and
     sends IR signals using this device driver, a mouse daemon that
     translates IR signals to mouse movements and a couple of user
     programs that allow to control your computer with a remote control.
     Takahide Higuchi wrote about LIRC: "It's great, and it seems almost
     complete solution, but it seems there is almost nothing supporting
     hardware on the market (or need to solder some special circuit ...
     it is hard work for many people to do so). I believe that LIRC will
     be more popular if consumer IR support is implemented in FastIR
     drivers and some common API (for example, a raw IrSocket and common
     ioctls) is made!". You may find LIRC at http://fsinfo.cs.uni-
     sb.de/~columbus/lirc/ <http://fsinfo.cs.uni-sb.de/~columbus/lirc/>

     To subscribe to the LIRC mailing list send an email to <lirc-
     request@xmission.com> with the word "subscribe" in the body of the
     message. There is also a mailing list archive at http://www.wh9.tu-
     dresden.de/~heinrich/lirc/list-archive/ <http://www.wh9.tu-
     dresden.de/~heinrich/lirc/list-archive/>


  o  Serial Infrared Remote Controller

     This is a simple, cheap device that can be connected to any serial
     port to control most components that have infrared remote controls.
     It was designed and built on a solderless breadboard and is finally
     designed as a PC board. You may find this package at
     http://www.armory.com/~spcecdt/remote/remote.html
     <http://www.armory.com/~spcecdt/remote/remote.html>


  o  Infrared Tools for the COREL Netwinder PC

     Ryan Shillington wrote some tools to control the COREL Netwinder
     via infrared, for example:

     Server Side for the Corel Palm Administrator (deamon). It depends
     on having ir-simple installed and up and running. With this you can
     check and change IP addresses, Gateway addresses, setup eth1, etc.
     You can also run simple commands AND you can check the Temperature,
     Memory, Load averages, etc.

     Client Side for the Corel Palm Administrator. You can also run
     simple commands AND you can check the Temperature, Memory, Load
     averages, etc.

     A very basic Infra Red device driver. This does not support IrDA
     (only unreliable transfers). It looks specifically for Remote
     Control signals (and Keyboard, etc.). It blocks and passes data up
     very differently.

     You may find the tools at http://www.netwinder.org/~ryansh/
     <http://www.netwinder.org/~ryansh/>


  o  ir

     ir <http://kramer.ne.mediaone.net/ir/> is an interface program to
     Chris Dodge's RedRat 2 infrared controller to send and receive
     infrared signals to/from consumer devices like TV's, VCR's, cable
     boxes, and stereos. It is written in Perl. It uses only the basic
     Perl constructs and no external packages, so it should work on any
     platform that supports Perl and serial communications. It can be
     accessed via the command line or cron, as an email handler (through
     aliases), or as a cgi script which will automatically generate a
     form with all possible codes. It has macro capability so one
     command can send a series of IR signals. With an X-10's IR543, it
     can be used to control X10 devices, too.



  16.2.  Infrared Remote Control - IrDA

  Two of the above mentioned projects use some kind of selfmade dongle
  for infrared remote control. There is also a description to build a
  serial IrDA dongle by yourself in the german ELEKTOR 5/97 p. 28
  magazine. Maybe someone can merge these two kind of dongles together.

  For a discussion of the relation between Infrared Remote Control and
  IrDA I quote from the Linux/IrDA mailing list (shortend and modified
  by wh):

  Ryan Shillington wrote: "Remote IR and ASK-IR are very different from
  FIR or MIR or SIR.

  Remote IR and ASK-IR are very low speed and low frequency (but very
  long range) uses for IR. They operate around 2400 baud.

  SIR operates at higher rates, and is meant for long range transmission
  where you need more than a few characters pass through (unlike a
  remote control).

  MIR is a little faster (less range), but with speeds up to 1.15 Mbps,
  and FIR (where the devices have to be practically touching) is 4Mbps.
  The range is inversely proportional to the speed you can send data at.

  I'm working on drivers for Remote-IR, but you should know that your IR
  stuff has to support it. Look for protocols like NEC, RC-5 or RC-0
  (those are the most common ones).

  You can use SIR to receive Remote Control signals. Set your baud rate
  nice and low and data will come through. BUT, from my experience, it's
  not the RIGHT data. It's not being analyzed in the right way, and as
  such, you can't compute the checksums or check it with its complement.

  I have managed to get data in (using SIR) with remote controls. I have
  been told that SIR will read the remote control stuff differently
  depending on temperature (although I have never had that experience).
  "

  Lichen Wang <lwang1@ix.netcom.com> wrote in response: "The so-called
  ASKIR in most laptops etc. is not meant for remote IR devices. ASKIR
  is meant for Sharp Wizard and Zauaus PDAs and some of Sharp's notebook
  PCs. Sharp stated this long before IrDA was established and is still
  supporting it to maintain backward compatibility. Apple's Newton had
  this capability at one time, too.

  Briefly, ASKIR uses 9.6 Kbps (19.2 and 38.4 Kbps are also possible)
  asynchronous data format of 8 data bits, 1 stop bit, and odd parity.
  The start bit as well as all 0 bit in data/parity are transmitted as
  IR square wave at 500 KHz (DASK sub-carrier). The stop bit as well as
  all 1 bit in data/parity are represented by the absence of any IR
  transmission.
  As you can see, this is totally incompatible with existing IR remote
  control.

  [..]

  True. Not only can you use SIR hardware to receive, you can transmit,
  too. Of course, there are some limitations.

  Most IR remote controls use 38 KHz sub-carrier. 3 times 38 is 114,
  very close to 115.2. You can set the UART to operate at 115.2 Kbps, 7
  data bits, no parity, and 1 stop bit - a total of 9 bits. Each 3
  cycles of the 38 KHz sub-carrier can be received or transmitted as a
  byte of 0x5B.

  There are some physical limitations in addition to the fact that the
  sub-carrier must be 38 KHz. The SIR receiver is not as sensitive to 38
  KHz as the IR remote receiver designed for that. The SIR transmitter
  has a much lower duty cycle and thus can not emit a strong sub-carrier
  either.

  IR remote encodes the control signal by turning on and off the sub-
  carrier at certain specific patterns. Now that you can transmit and
  receive the sub-carrier, what remains is all in timing.

  For transmit, you have to know how many consecutive bytes of 0x5B to
  send for each burst of the sub-carrier, and how long to be quiet
  between the bursts.

  For receive, you have to know how many of the 0x5Bs you received are
  consecutive, and how long the gaps were between these groups of
  consecutive bytes.

  [..]

  My experience with the IrDA link distance of SIR, MIR and FIR is
  somewhat different from what Ryan said.

  [..]

  SIR, MIR and FIR should all work from 0 to 100 cm but in practice:

  (a) Some devices may have problems at LONG distances.

  When possible, place the two communicating devices no more than 50 cm
  apart. Low power devices, such as pagers, phones, etc. may have even
  shorter ranges despite the fact that they use SIR instead of MIR or
  FIR.

  (b) Some devices may have problems at SHORT distances.

  Place the two devices at least a few cm apart. Putting the two devices
  too close to each other can cause troubles.

  It is somewhat intuitive that when the link is not reliable we put the
  two devices closer together. But it is counterintuitive that too close
  is not good either. The reason is that the light intensity at 1 cm is
  10.000 times brighter than that at 100 cm. At 0.5 cm, it is 40.000
  times, etc. The IR receiver manufacturers have difficulties to cover
  this huge dynamic range. We all have problems reading under a 10 W
  light bulb, but imagine how it feels under a 100.000 W light!

  [..]

  The IrDA Physical Layer is totally incompatible with the DASK
  modulation used in IR remote controls. Thus it is not possible to use
  the same controller function for both FIR and remote control. However,
  practically all FIR controller chips do include some additional
  functions to support remote control. National, SMC, and Winbond (just
  to name a few) all have such I/O chips.

  The IR transmitter for FIR and remote control are very similar. I have
  tried a standard FIR transmitter. It can reach 10 meters for remote
  control purpose. Thus it performs just as good as transmitters
  designed for remote control.

  The IR receiver for FIR and remote control are somewhat different. A
  FIR receiver can receive remote control signals but can reach only 1
  meter whereas receivers designed for remote control typically can
  reach 10 meters.

  I have an ISA bus adapter with a National I/O chip that supports both
  FIR and remote control. I also have IR Dongles that include both FIR
  and remote control receivers. (Plus a transmitter for both modes.) I
  cannot find any software to support remote control functions. I did my
  own experiments in DOS (I cannot run Linux yet.) Anybody interest in
  this? "

  Benny Amorsen wrote: "I have a laptop that is supposed to support
  ASKIR. The mode of the infrared port can be switched to ASKIR in the
  BIOS. Having to reboot to switch the mode in the BIOS makes it
  useless, though, so someone would have to find a way to switch on the
  fly. "

  Dag Brattli wrote: It should be possible to use IrControl (formerly
  IrBus) for IrDA compliant remote controls. I currently don't know
  about any remote controls using IrControl standard, but there should
  be some out there (anyone else who knows better?). You should go to
  the IrDA site (http://www.irda.org) and get the physical layer
  standard (which includes IrControl I think).

  "Normal" IrDA (using IrLAP) is _not_ well suited for remote control
  because of the connection oriented nature (and just supports 9600bps
  for connectionless use). The reason for the limited range is eye-
  safety they say (but I currently don't know why CIR works better using
  the same power). I have however seen laptops connect at 4-5 meters
  (but I don't think that any high speed communication would be
  possible).

  Most IrDA chipsets are capable of CIR operation, and it is quite easy
  to modify the drivers so they talk CIR. Takahide Higuchi has started
  to look at IrSockets and it would be great if we could open a "raw"
  Ir(DA) socket which then could send and receive CIR packets. Then all
  the CIR applications could live in userspace.

  I know that Corel is interested in using CIR for controlling the
  NetWinder (and they actually have running code). Take a look at
  http://www.slashdot.org/articles/98/12/05/0916216.shtml
  <http://www.slashdot.org/articles/98/12/05/0916216.shtml> or
  http://www.netwinder.org/~ryansh <http://www.netwinder.org/~ryansh>

  From the "IrDA Data Link Design Guide" p. 21 by Hewlett-Packard
  http://www.hp.com/go/ir <http://www.hp.com/go/ir> : " It is possible
  to transmit and receive signals other than IrDA signals with Hewlett-
  Packard IR transceivers. For implementation details, please refer to
  the Application Note, Transceiver Performance with ASK and TV Remote
  Signals."

  From the IR-MAN page http://www.usuarios.com/ib308564/irda.html
  <http://www.usuarios.com/ib308564/irda.html> :

  Fortunately, many IrDA devices are compatible with the 38-kbps ASK
  modulation used in TV remotes. This means that they can work with such
  kind of infrared type signals. ... However, it seems that there are
  still many portable computers that can't receive TV infrared stuff.

  For desktop computers, there exist two options, depending on the
  motherboard you have. Usually a Pentium MoBo has an I/O chipset ready
  for infrared communication. There is a special connector where you can
  connect the transducer. The other option is buying a serial type
  transceiver that connects to the standard serial port (RS-232) of the
  computer. ... PC Remote Control has been tested with success using
  both type of IrDA devices:

  1) IRmate IR-210 Serial Port Infrared Adapter. ... The serial port
  speed at wich the device sends recognizable data values is 2400 bps. I
  don't know if this speed will be the same for all the adapters of this
  type or is an unique characteristic of this model.

  Look at the examples of data values received to see how similar are
  them. There are some infrared commands that change a lot every time,
  difficulting the recognition. In such cases, a great tolerance in the
  comparison could be used, but the risk of confusion between different
  commands will be increased. An apropiate tolerance value for almost
  all cases is 20.

  2) Actisys IR2000L connected to an Asus P2B motherboard. ... There are
  several serial port speeds that work well, although 4800 bps seems to
  be the best one. Other adapters of this same type work also well using
  this speed. Take a look at the samples of data sequences received
  using this device. Some remote buttons send exactly the same sequence
  and it's impossible to distinguish between them at all.

  3) Asus IR-eye connected to the same MoBo as above. It works as well
  as the Actisys device.

  TV remotes send commands only one way, in a low-speed burst for
  distances of up to 30 feet. They use directed IR with LEDs that have a
  moderate cone angle to improve ease-of-use characteristics. Cordless
  connectivity via IrDA transfers files, point-to-point and
  bidirectionally, in a high-speed burst for short distances using
  directed IR with LEDs having a narrow cone angle. IrDA transmissions
  require relatively careful aiming, and they're easy to block. For this
  reason, don't expect a great distance while working with the remote
  unit.

  Alessio Massaro <Alessio.Massaro@cern.ch>: wrote: " IrDA doesn't talk
  to tv-remotes, but it does have the IrCOMM layer to emulate a serial
  i/f. My guess is that to get LIRC working with it, you should just
  need ... to read from the IrCOMM virtual serial device (as you would
  with a /dev/cua or whatever) and use a remote that can be seen by your
  dongle+IrDAheader pair."

  Answer by Dag Brattli: "You are talking about being normal serial
  ports, but that is something at least I have choosen IrDA not to be. I
  have implemented all the device drivers as network device drivers, so
  things are a bit different (more frame oriented). The device drivers
  deliver IrDA frames and currently nothing else.

  But I don't think that we must have a tty interface to the IrDA device
  drivers in order to support more RAW reads and writes. And btw. forget
  about IrCOMM, it has nothing to do with this issue.

  I have actually already implemented support for raw reads and writes
  for the device drivers, since some of the dongles require this."



  17.  Infrared and Eye Safety

  This section summarizes some ideas and thoughts that were exchanged on
  the Linux/IrDA mailing list. It is not medically wellfounded, and
  whoever has better evidence or some more wellfounded source of
  information is encouraged to contribute it to this HOWTO.

  The IrDA spec says that the range of IrDA devices has been limited to
  1m for reasons of eye safety. Another plausible assumption is that
  power consumption and IR pollution/crosstalk were reasons for this
  limitation. In principle there could be danger for the eye, because
  infrared light is not registered by the eye, and thus the pupil won't
  close in order to protect the retina from bright IR light sources.
  This is the same situation as with UV light, which will cause snow
  blindness eventually, but in contrast to UV light, IR light contains
  much less harmful energy due to its longer wavelength.

  The only legal restrictions and medical advices we were able to find
  on the web were concerned with infrared emissions of heat lamps or in
  the welding process and IEC 825-1 (CENELEC EN60825-1). This suggests
  that IR light as emitted by IrDA devices will be harmless, since even
  the peak power emitted by strong IR LEDs (ca. 300mW) is several orders
  of magnitude below the power emitted by medical IR heat lamps (up to
  500W). For these, however, you are supposed to wear protective
  goggles, so maybe if you are looking straight into 1.000 infrared LEDs
  flashing at once, you should do so, too. The effect of infrared light
  is mostly heat, though, and not an alteration or destruction of the
  biological cell structure, such as caused by UV light. Though in the
  specs for the HP OmniBook 800 Hewlett-Packard recommends not to look
  directly into the IR LED.

  As stated above, this discussion is only based on guesswork and common
  sense assumptions about the data found in IR LED and heat lamp specs.
  If anybody with a better medical knowledge can comment on this, please
  do so!!!


  18.  Credits

  Thanks to:

  o  Dag Brattli - Linux/IrDA core team

  o  Thomas Davis - Linux/IrDA core team

  o  Takahide Higuchi - Linux/IrDA core team

  o  Ralf Zabka

  o  Benny Amorsen

  o  Lichen Wang

  o  Ryan Shillington

  o  Richard Titmuss

  o  Fons Botman

  o  Rui Oliveira

  o  Jon Howell

  o  Carlos Vidal


  o  Joonas Lehtinen

  o  Markus Schill

  o  Bjoern Hansson

  o  Pawel Machek

  o  Ho Chin Keong

  o  Bjoern Mork

  o  Andreas Butz

  o  Tang Ning

  o  Philip Blundell

  o  Toni van de Wiel

  o  Stefan Dahlke

  o  Ales Dryak

  o  Richard Donkin

  o  Wessel de Roode

  o  Andrew Chadwick

  o  James McKenzie

  o  Gerd Knorr

  o  Claudiu Costin

  o  K-H. Eischer

  o  Alessio Massaro

  o  Igor Pesando

  o  Mathieu Arnold

  o  Harald Milz

  o  The members of the Linux-IrDA mailing list.

  o  The writers of the other HOWTOs which gave me many inspirations.

  o  The developers of the SGML-Tools which provided some means to write
     a HOWTO.

     Sorry I didn't start to follow the credits when starting the HOWTO,
     so probably I forgot somebody.


  19.  Revision History


  o  v0.1 to v0.4a, 19 March 1998 to 4 August 1998, drafts, not included
     in the LDP

  o  v1.0, 14 August 1998, release to the LDP


  o  v1.1, 18 August 1998, added info about IrCOMM patch by Takahide
     Higuchi, minor changes

  o  v1.2, 24 August 1998, updated to linux-irda-1998-08-20 snapshot,
     added FIR section and revision history, minor changes

  o  v1.3, 27 September 1998, added sections about multiple instances,
     cellular phones, digital cameras,Linux to Linux connection, the
     cutting edge - CVS, power saving; some changes in general
     configuration section, changes in hardware survey section, minor
     changes

  o  v1.4, 11 October 1998, better description of IrCOMM support,
     changes in dongle connection section, changes in Palm III section,
     minor changes

  o  v1.5, 12 October 1998, minor changes

  o  v1.6, 26 October 1998, section about IrManager added, updated to
     the linux-irda-1998-10-21 snapshot, changed dongle connection
     section, minor changes

  o  v1.7, 1 November 1998, added remote control section, changed dongle
     connection section, minor changes

  o  v2.0, 9 January 1999, nearly complete rewrite and rearrangement
     according to the new structure of Linux/IR which is included into
     the kernel since 2.1.131, added info about BIOS support into dongle
     connection section, configuration tool section and CVS section
     removed

  o  v2.1, 13 January 1999, minor changes

  o  v2.2, 26 January 1999, project name changed from Linux/IR to
     Linux/IrDA, extended the Troubleshooting chapter, changed the order
     of the Known Bugs chapter after the Troubleshooting chapter,
     removed some lint

  o  v2.3, 4 February 1999, added chapter about Eye Safety written by
     Andreas Butz; spell checking, reworking of Kernel Parameters
     chapter and additional information by Andreas Butz; minor changes

  o  v2.4, 9 February 1999, changed information about applying a patch
     file

  o  v2.5, 12 March 1999; new URL for Linux/IrDA; added chapters about
     Big Endian support, irdaping, irdadump and Beyond IrDA - Extending
     Transmission Distance; chapter Obtaining Information about the
     Infrared Port in Laptops improved; added many information provided
     by Fons Botman to Windows chapter; added SMP chapter; informations
     about Ericsson SH888 added; removed obsolete FAQs; minor changes

  o  v2.6, 6 April 1999, added chapters Connection to Docking Station,
     Connection to Keyboard and Connection via Serial Cable, minor
     changes

  o  v2.7, 11 June 1999 started chapter Upcoming Standards (Bluetooth
     and IrDA), added annotations about CORBA to GUI chapter, minor
     information about Nokia cellular phones added, added Appendix B
     Serial Infrared Port Sniffer, started IrDA Network Neighborhood
     section, started Connection to Psion 5 chapter and Appendix C,
     minor additions to LiRC chapter, minor changes

  o  v2.8, 20 September 1999, added LiRC mailing list, changed <htmlurl
     ... > tag to <url ...>, changed format of conf.modules entries,
     addition to hardware detection (PCMCIA), added IrDA mailing list,
     changed address of Linux-IrDA mailing list, minor additions to
     multiple instances section, added URL of French translation, added
     new sersniff to Appendix B, added section about precompiled
     packages, added Palm III Connection to Thinkpad 600 chapter, minor
     changes



  20.  Copyright and Disclaimer

  Copyright (C) 1998, 1999 by Werner Heuser. This document may be
  distributed under the terms set forth in the LDP license at LDP
  <http://metalab.unc.edu/LDP/COPYRIGHT.html>.

  The information in this document is correct to the best of my
  knowledge, but there's a always a chance I've made some mistakes, so
  don't follow everything too blindly, especially if it seems wrong.
  Nothing here should have a detrimental effect on your computer, but
  just in case I take no responsibility for any damages incurred from
  the use of the information contained herein.


  21.  Appendix A - Configuration Script

  Configuration script by Ove Ewerlid (please change to new major device
  numbers, wh):



  ______________________________________________________________________
  #!/bin/sh

  # You may have problems if kerneld is running!

  killall irattach
  killall irmanager

  sleep 1

  rm -f /dev/ircomm
  mknod /dev/ircomm c 60 64

  rmmod ircomm_tty
  rmmod ircomm
  rmmod irtty
  rmmod irda

  insmod irda
  insmod irtty
  insmod ircomm
  insmod ircomm_tty

  irmanager    # executes 'irattach /dev/ttyS1' based on /etc/irda/drivers


  # Now start your favorite PPP software on /dev/ircomm

  # The 'no activity on link' happens if you move the phone out of IR sight, this is no problem once the phone is back in sight!

  # Mar 10 12:31:41 octagon kernel: Linux-2.2 Support for the IrDA (tm) Protocols (Dag Brattli)
  # Mar 10 12:31:41 octagon kernel: IrCOMM_common, $Revision: 1.13 $ $Date: 1998/10/13 12:59:05 $ (Takahide Higuchi)
  # Mar 10 12:31:41 octagon kernel: IrVTD, $Revision: 1.2 $ $Date: 1998/09/27 08:37:04 $ (Takahide Higuchi)
  # Mar 10 12:31:41 octagon irmanager: executing: './drivers start  0'
  # Mar 10 12:31:41 octagon irmanager: + 0.1 Fri Jul 25 11:45:26 1997 Dag Brattli
  # Mar 10 12:31:41 octagon irattach: Serial connection established.
  # Mar 10 12:31:41 octagon kernel: IrDA device irda0 registered.
  # Mar 10 12:31:41 octagon irmanager: + 0.1 Fri Jul 25 11:45:26 1997 Dag Brattli
  # ...
  # Mar 11 13:13:43 octagon kernel: IrLAP, no activity on link!
  ______________________________________________________________________



  22.  Appendix B - Serial Infrared Port Sniffers


  22.1.  Sniffer by Gerd Knorr

  This programm is a courtesy by Gerd Knorr. You may use it to sniff the
  traffic which is going trough your IrDA port for details of the
  protocol (change the default ttyS1 in the source if necessary):



  ______________________________________________________________________
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <string.h>
  #include <fcntl.h>
  #include <termios.h>
  #include <ctype.h>
  #include <sys/types.h>
  #include <sys/time.h>
  #include <sys/ioctl.h>

  #define BUFSIZE 1024

  int
  read_and_print(int fd, int sec, int usec)
  {
      int             rc,l,i;
      char            buf[BUFSIZE+1];
      fd_set          set;
      struct timeval  tv;

      if (sec || usec) {
          FD_ZERO(&set);
          FD_SET(fd,&set);
          tv.tv_sec  = sec;

          tv.tv_usec = usec;
          if (0 == select(fd+1,&set,NULL,NULL,&tv))
              return -1;
      }

      switch (rc = read(fd,buf,BUFSIZE)) {
      case 0:
          printf("EOF");
          exit(0);
          break;
      case -1:
          perror("read");
          exit(1);
      default:
          for (l = 0; l < rc; l+= 16) {
              printf("%04x  ",l);
              for (i = l; i < l+16; i++) {
                  if (i < rc)
                      printf("%02x ",buf[i]);
                  else
                      printf("-- ");
                  if ((i%4) == 3)
                      printf(" ");
              }
              for (i = l; i < l+16; i++) {

                  if (i < rc)
                      printf("%c",isalnum(buf[i]) ? buf[i] : '.');
              }
              printf("\n");
          }
          break;
      }
      return rc;
  }

  void
  setlines(int fd, int rts, int dtr)
  {
      int lines = 0;

      if (rts) lines |= TIOCM_RTS;
      if (dtr) lines |= TIOCM_DTR;

      ioctl(fd,TIOCMSET,&lines);
  }

  int main(int argc, char *argv[])
  {
      int                 ser,i;
      struct termios      saved_attributes,tattr;
      struct winsize      win;
      char                buf[16];

      if (-1 == (ser = open("/dev/ttyS1",O_RDWR))) {
          perror("open /dev/ttyS1");
          exit(1);
      }

      /* Set the terminal mode */
      tcgetattr (ser, &tattr);
      cfmakeraw (&tattr);
      cfsetospeed (&tattr,B9600);
      cfsetispeed (&tattr,B9600);
      tcsetattr (ser, 0, &tattr);

      setlines(ser,0,0);
  #if 0
      tcsendbreak(ser,0);
  #endif

      /* main loop */
      fprintf(stderr,"setup done\n");
      while (-1 != read_and_print(ser,30,0)) {
          usleep(100000);
      }

      return 0;
  }
  ______________________________________________________________________



  22.2.  sersniff

  Written by Jonathan McDowell sersniff
  <http://www.earth.li/projectpurple/progs/sersniff.html> is a simple
  program to tunnel/sniff between 2 serial ports. The program was
  written to aid with the decoding of the protocol used by the Nokia
  9000i Communicator to talk to the NServer software Nokia provides,
  which only runs under Windows.


  23.  Appendix C - User space application for Psion 5 Palmtop Comput-
  ers: psion.c



  ______________________________________________________________________
  /*********************************************************************
   *
   * Filename:      psion5.c
   * Version:       0.1
   * Description:   User space application for Psion 5 Palmtop Computers
   * Status:        Experimental.
   * Author:        Fons Botman <budely@tref.nl>
   * Created at:    Mon Apr 19 21:51:29 CEST 1999
   *
   *     Copyright (c) 1999, Fons Botman, All Rights Reserved.
   *
   *     This program is free software; you can redistribute it and/or
   *     modify it under the terms of the GNU General Public License as
   *     published by the Free Software Foundation; either version 2 of
   *     the License, or (at your option) any later version.
   *
   *     Neither Fons Botman nor anyone else admit liability nor
   *     provide warranty for any of this software. This material is
   *     provided "AS-IS" and at no charge.
   *
   ********************************************************************/

  #include <unistd.h>
  #include <stdlib.h>
  #include <string.h>
  #include <fcntl.h>
  #include <stdio.h>
  #include <errno.h>
  #include <assert.h>
  #include <signal.h>
  #include <time.h>
  #include <sys/types.h>
  #include <utime.h>

  #include <sys/stat.h>
  #include <sys/ioctl.h>
  #include <netinet/in.h>

  #include <sys/socket.h>
  #include <linux/types.h>
  #include <linux/irda.h>

  #ifndef AF_IRDA
  #define AF_IRDA 23
  #endif /* AF_IRDA */



  #define MAX_DEVICES 10

  int discover_devices(int fd)
  {
          struct irda_device_list *list;
          unsigned char *buf;
          int len;
          int i;
          int daddr = 0;

          len = sizeof(struct irda_device_list) +
                  sizeof(struct irda_device_info) * MAX_DEVICES;

          /* FIXME */
          system("echo 150 > /proc/sys/net/irda/slot_timeout");

          if (!(buf = malloc(len))) {
                  fprintf(stderr, "Could not allocate discovery buffer.\n");
                  exit(1);
          }
          list = (struct irda_device_list *) buf;

          /* FIXME: discovery does not return when there are no devices */
          if (getsockopt(fd, SOL_IRLMP, IRLMP_ENUMDEVICES, buf, &len)) {
                  perror("getsockopt");
                  exit(-1);
          }

          if (len > 0) {
                  printf("Discovered:\n");

                  for (i=0;i<list->len;i++) {
                          printf("  daddr: %08x", list->dev[i].daddr);
                          printf("  saddr: %08x", list->dev[i].saddr);
                          printf("  name:  %s\n", list->dev[i].info);
                          daddr = list->dev[i].daddr;
                  }
          } else {
                  printf("No devices discovered.\n");
          }

          return daddr;
  }


  int irttp_get_mtu(int fd) {
          int mtu;
          int len = sizeof(int);
          /* Check what the IrTTP data size is */
          if (getsockopt(fd, SOL_IRLMP, IRTTP_MAX_SDU_SIZE,
                         (void *)&mtu, &len)) {
                  return -1;
          }
          return mtu;
  }


  int sendfile(char* filename) {
          int fd;
          struct sockaddr_irda peer;
          int daddr;
          FILE* f;
          int buflen;
          char *buf;
          int rc;
          struct stat s;
          int cnt;
          int t0, tx, t;
          unsigned long long int fdatell;

          fd = socket(AF_IRDA, SOCK_STREAM, 0);
          if (fd < 0) {
                  perror("socket");
                  if (errno == EINVAL)
                          fprintf(stderr, "Is IrDA active?, perhaps run irmanager\n");
                  exit(-1);
          }

          /* FIXME: We should use a better/any device selection mechanism */
          daddr = discover_devices(fd);
          if (!daddr) {
                  fprintf(stderr,"No IRDA device found\n");
                  exit(1);
          }

          peer.sir_family = AF_IRDA;
          peer.sir_addr = daddr;
          strcpy(peer.sir_name, "Epoc32:EikonIr:v1.0");

          if (connect(fd, (struct sockaddr *) &peer,
                      sizeof(struct sockaddr_irda))) {
                  perror("connect");
                  if (errno == ENETUNREACH)
                          /* P5: System ^L IrDA is active,
                             but IR-receive not selected */
                          fprintf(stderr,
                                  "No Psion5 or IR-receive is not selected\n");
                  exit(-1);
          }
          printf("Connected to %x\n", daddr);

          buflen = irttp_get_mtu(fd);
          printf("mtu = %d\n", buflen);
          if (buflen < 2) {
                  perror("irttp_get_mtu");
                  exit(1);
          }
          if (!(buf = malloc(buflen))) {
                  perror("malloc");
                  exit(1);
          }
          /*
             FIXME : I got strange results when the buffer size was less than
             the mtu (e.g. 200), the psion did not seem to see the frames were
             not full length, and stopped after the number of frames based on
             the full mtu size.
             investigate.
          */

          /*
             FIXME : psion connects to port 2, but does not get error back
             from us. Linux bug?
          */

          if (!(f = fopen(filename,"rb"))) {
                  perror(filename);
                  exit(1);
          }

          rc = stat(filename,&s);
          if (rc != 0) {
                  perror("stat");
                  exit(1);
          }

          /* FIXME map psion mode bits to unix filemodes */

          fdatell = 62168263200000000ULL + 1000000 *
                  ( s.st_mtime & 0x00000000FFFFFFFFULL);
          printf("date: %Ld\n", (unsigned long long) s.st_mtime);
          printf("date: %Ld\n", fdatell);
          sprintf(buf,"FILE %d %d %lu %lu %s",
                  (int) s.st_size,
                  32 | (s.st_mode & S_IWUSR ? 0 : 1),
                  (unsigned long) ((unsigned long long int) fdatell >> 32),
                  (unsigned long) (fdatell & 0x00000000FFFFFFFFULL),
                  filename);
          rc = write(fd,buf,strlen(buf));
          if (rc != strlen(buf)) {
                  perror("write");
                  fprintf(stderr,"rc = %d, strlen=%d\n",
                          rc, strlen(buf));
                  exit(1);
          }
          printf("sent: %s\n", buf);
          rc = read(fd,buf,buflen-1);
          printf("Received (%d) ", rc);
          if (rc < 0) {
                  perror("reply error");
                  exit(1);
          }
          if (rc == 0) {
                  fprintf(stderr, "EOF on reply?\n");
                  exit(1);
          }
          if (rc < buflen) {
                  buf[rc] = 0;
          }
          /* should be "ACK Y" */
          if (0 != strcmp(buf,"ACK Y")) {
                  fprintf(stderr, "Unexpected response: %s\n", buf);
                  exit(1);
          }
          printf("%s\n", buf);

          cnt = 0;
          t0 = tx = t = time(NULL);

          while (!ferror(f) && !feof(f)) {
                  int wrc;

                  rc = fread(buf, 1, buflen, f);
                  if (rc == 0) continue;

                  wrc = write(fd,buf,rc);
                  if (wrc < 0) {
                          perror("write");
                          exit(1);
                  }
                  if (wrc < rc) {
                          fprintf(stderr, "Problem: only sent %d of %d\n",
                                  wrc, rc);
                          exit(1);
                  }

                  /* progress indication */
                  t = time(NULL);
                  cnt += rc;
                  if (t - t0 == 0 || cnt == 0 || tx == t)
                          /* avoid division errors */
                          /* only once per second */
                          continue;
                  tx = t;
                  printf("sent %d/%lu bytes=%4g%% in %d sec,"
                         " %g Kbytes/s, to go %li sec  \r",
                         cnt, s.st_size, 100.0 * cnt / s.st_size, t - t0,
                         cnt / 1000.0 / (t - t0),
                         ( s.st_size - cnt ) * (t - t0) / cnt);
                  fflush(stdout);
          }
          if (ferror(f)) {
                  perror("ferror");
                  exit(1);
          }
          if (cnt != s.st_size) {
                  printf("Warning: "
                         "file size changed: initial: %lu, actual: %d\n",
                         s.st_size, cnt);
          }
          if (t == t0) t++;       /* white lie for fast transfers */
          printf("\r%79s\r","");        /* Cleanup the progress line */
          printf("Sent %s, %d bytes in %d sec. %g KBytes/sec\n",
                 filename, cnt, t - t0, cnt / 1000.0 / (t - t0));

          /* Check for close on the other side */
          rc = read(fd,buf,buflen);
          if (rc > 0) {
                  fprintf(stderr, "Strange: the other side responded.\n");
                  fprintf(stderr, "rc=%d, data:%s\n", rc, buf);
                  exit(1);
          }
          if (rc == 0) {
                  fprintf(stderr, "Received end of file.\n");
          }
          if (rc == -1) {
                  if (errno == EPERM) {
                          /* Strange error code to get in this case */
                          printf("Other side closed connection, OK\n");
                  } else {
                          perror("last read");
                          exit(1);
                  }
          }

          close(fd);
          return 0;
  }

  int handle_client(int cfd) {
          int buflen;
          char* buf;
          int rc;

          /* fields of file transfer header */
          unsigned int fsize;
          unsigned int fmode;
          unsigned int fdate1;
          unsigned int fdate2;
          char* fname;

          unsigned int fdate;
          unsigned long long int fdatell;

          FILE* f;
          int cnt;

          int t0, tx, t;

          buflen = irttp_get_mtu(cfd);
          printf("mtu=%d\n", buflen);
          if (buflen < 2) {
                  perror("irttp_get_mtu");
                  exit(1);
          }
          if (!(buf = malloc(buflen))) {
                  fprintf(stderr, "malloc buf failed\n");
                  exit(1);
          }

          /* Wait for the other side to send a header */
          /*
             Sample headers received:
             DATA 185
             FILE 55175 32 14689800 2691219200 Data
                  size mode datehi  datelo     name
          */

          rc = read(cfd, buf, buflen);
          if (rc < 0) {
                  perror("1st read");
                  exit(1);
          }
          if (rc == 0) {
                  perror("1st read 0");
                  exit(1);
          }
          assert(rc < buflen);
          buf[rc] = 0;
          printf("%s\n", buf);

          fsize = 0;
          fdate = 0;
          if (0 == strncmp(buf, "FILE ", 5)) {
                  cnt = 0; /* to be safe */
                  rc = sscanf(buf, "FILE %u %u %u %u %n",
                              &fsize, &fmode, &fdate1, &fdate2,
                              &cnt);
                  if (!(rc == 4 || rc == 5)) {
                                  /* grumble */
                          fprintf(stderr, "sscanf rc=%d\n", rc);
                          exit(1);
                  }
                  assert(cnt < buflen);
                  fname = strdup(buf+cnt);
                  fdatell = ((unsigned long long int) fdate1 << 32) + fdate2;
                  fdate = ( fdatell - 62168263200000000ULL) / 1000000 ;

                  printf("filename: %s\n", fname);
                  printf("filesize: %d\n", fsize);
                  printf("Filemode: %d", fmode);
                  printf("%s", (fmode &  1 ? ", Readonly" : ""));
                  printf("%s", (fmode &  2 ? ", Hidden" : ""));
                  printf("%s", (fmode & 32 ? ", Modified" : ""));
                  printf("%s", (fmode & ~35 ? ", Unknown" : ""));
                  printf("\n");
                  printf("fdate1:   %u = 0x%x\n", fdate1, fdate1);
                  printf("fdate2:   %u = 0x%x\n", fdate2, fdate2);
                  printf("filedate: %Ld\n", fdatell);
                  printf("filedate: %d = %s", fdate,
                         asctime(gmtime((time_t*)&fdate)));

                  if (!(f = fopen(fname,"wb"))) {
                          perror(fname);
                          exit(1);
                  }
          } else if (0 == strncmp(buf, "DATA ", 5)) {
                  cnt = 0; /* to be safe */
                  rc = sscanf(buf, "DATA %d", &fsize);
                  if (rc != 1) {
                          fprintf(stderr, "sscanf rc=%d\n", rc);
                          exit(1);
                  }
                  assert(cnt < buflen);
                  fname = strdup("/tmp/psion5-data");
                  if (!(f = fopen(fname,"wb"))) {
                          perror(fname);
                          exit(1);
                  }
          } else {
                  fprintf(stderr, "Unknown data type: %s\n", buf);
                                  /* exit(1); */
          }

          rc = write(cfd,"ACK Y",5);
          if (rc != 5) {
                  perror("1st write");
                  fprintf(stderr,"1st write rc = %d\n", rc);
                  exit(1);
          }

          cnt = 0;
          t0 = tx = t = time(NULL);
          while (cnt < fsize) {
                  int wrc;
                  rc = read(cfd,buf,buflen);
                  if (rc < 0) {
                          perror("data read");
                                  /* EPERM on disconnect ? */
                          exit(1);
                  }
                  if (rc == 0) {
                          perror("data read 0");
                          exit(1);
                  }
                  wrc = fwrite(buf,rc,1,f);
                  if (wrc != 1) {
                          perror("fwrite");
                          exit(1);
                  }
                  cnt += rc;

                  /* progress indication */
                  t = time(NULL);
                  if (t - t0 == 0 || cnt == 0 || tx == t)
                          /* avoid division errors */
                          /* only once per second */
                          continue;
                  tx = t;
                  printf("got %d/%u bytes=%g%% in %d sec,"
                         " %g Kbytes/s, to go %i sec  \r",
                         cnt, fsize, 100.0 * cnt / fsize, t - t0,
                         cnt / 1000.0 / (t - t0),
                         ( fsize - cnt ) * (t - t0) / cnt);
                  fflush(stdout);
          }

          if (cnt != fsize) {
                  printf("Warning: "
                         "file size changed: initial: %u, actual: %d\n",
                         fsize, cnt);
          }
          if (t == t0) t++;       /* white lie for fast transfers */
          printf("\r%79s\r","");        /* Cleanup the progress line */
          printf("Received %s, %d bytes in %d sec. %g KBytes/sec\n",
                 fname, cnt, t - t0, cnt / 1000.0 / (t - t0));

          rc = fclose(f);
          if (rc != 0) {
                  perror("fclose");
                  exit(1);
          }
          if (fdate) {
                  struct utimbuf utb;
                  utb.actime = fdate;
                  utb.modtime = fdate;
                  rc = utime(fname,&utb);
                  if (rc != 0) {
                          perror(fname);
                  }
          }
          free(fname);
          close(cfd);
          return 0;
  }

  int receivefile(int mode)
  {
          /*
             The Psion 5 tries the following connections:
             Epoc32:EikonIr:v1.0  IrDA:TinyTP:LsapSel
             IrDA:IrCOMM          Parameters
             IrLPT                IrDA:IrLMP:LsapSel
             connect on 2

             Warning: discovery reply after 101ms
          */

          int addrlen = sizeof(struct sockaddr_irda);
          /* int oflags; */
          /* int mtu; */
          int fd;
          struct sockaddr_irda peer;
          int cfd;

          /* Create socket */
          fd = socket(AF_IRDA, SOCK_STREAM, 0);
          if (fd < 0) {
                  perror("socket");
                  exit(-1);
          }

          /* Bind local service */
          peer.sir_family = AF_IRDA;
          strcpy(peer.sir_name, "Epoc32:EikonIr:v1.0");
          peer.sir_lsap_sel = LSAP_ANY;

          if (bind(fd, (struct sockaddr*)&peer, sizeof(struct sockaddr_irda))) {
                          perror("bind");
                          return -1;
          }

          if (listen(fd, 2)) {
                  perror("listen");
                  return -1;
          }

          /* FIXME: allow more simultaneous clients */
          for (;;) {
                  cfd = accept(fd, (struct sockaddr *) &peer, &addrlen);
                  if (cfd < 0) {
                          perror("accept");
                          return -1;
                  }

                  if (handle_client(cfd))
                          break;

                  if (mode == 1)
                          break;
          }

          sleep(1);
          close(fd);
          return 0;
  }


  int
  main(int argc, char* argv[]) {
          char* argv0 = argv[0];

          if (argc <= 1) {
                  fprintf(stderr, "Usage: %s [-s file] [-r] [-d]\n", argv0);
                  fprintf(stderr, "\t-s file\tSend file to the Psion\n");
                  fprintf(stderr, "\t-r\tReceive a file from the Psion\n");
                  fprintf(stderr, "\t-b\tReceive multiple files (batch mode)\n");
                  exit(1);
          }

          /* skip program name */
          argv++; argc--;

          for ( ; argc>0 && argv[0] ; argc-- , argv++) {
                  if (0 == strcmp(argv[0],"-s")) {
                          /* FIXME: sending multiple files does not
                             work yet. We need to wait for the user
                             to select receive again on the psion */
                          if (argv[1] && 0 == strcmp(argv[1],"--")) {
                                  /* Allow the user to send ANY filename */
                                  argv++; argv++;
                                  for ( ; argv[1] ; argv++ , argc--) {
                                          sendfile(argv[1]);
                                  }
                          } else {
                                  /* Send files upto next switch */
                                  while (argv[1] && *argv[1] != '-') {
                                          sendfile(argv[1]);
                                          argv++; argc--;
                                  }
                          }
                  } else if (argv[0] && 0 == strcmp(argv[0],"-r")) {
                          receivefile(1);
                  } else if (argv[0] && 0 == strcmp(argv[0],"-b"))
                          receivefile(0);
                  else {
                          fprintf(stderr,"Error: unknown switch %s\n", argv[0]);
                          fprintf(stderr,"Call without args for usage: %s\n",
                                  argv0);
                          exit(1);
                  }
          }
          return 0;
  }
  ______________________________________________________________________



