Greetings folks



Here's a note on how to get Empeg talking to another box using TCP/IP over IR.



Regards

Amit

TCP/IP over Infra-red on the Empeg

Making two Linuces talk TCP/IP over IR

pre-install nsc-ircc setserial /dev/ttyS2 port 0 irq0 

alias irda0 nsc-ircc 

options nsc-ircc io=0x3e8 dma=0 irq=10 dongle_id=0x09 

alias tty-ldisc-11 irtty 

alias char-major-161 ircomm-tty 

alias char-major-10-187 irnet  

• A development kernel with IrDA and PPP support. I compiled my own kernel (unchanged 2.2.14 sources as provided by Rio), but I believe any appropriate kernel will do.
  
• The PPP package (ppp_2.3.11-1.4.deb currently for Debian-potato).
  
• The irda-tools package (irda-tools_0.9.5-2.deb currently).
  
• The irda-common package (irda-common_0.9.5-2.deb currently).
  

• Let us treat the "other" (Linux 1) machine as a PPP server. It is assumed that your IR hardware is identified by the kernel and is working. The system service "irda" must also be started (in other words, an "irattach" must be performed, like "irattach /dev/ttyS2 -s 1" - please refer to IR documentation). Moreover, the relevant devices must exist (/dev/ircomm0, ...)
  
• Start up irda on Linux 1, if it is not already started.
  
• Execute "echo 1 > /proc/sys/net/irda/discovery" on Linux 1.
  
• Execute "pppd /dev/ircomm0 115200 noauth x.x.x.x:y.y.y.y" on Linux 1, where x.x.x.x and y.y.y.y are two appropriate IP addresses to be used for the Point-to-Point link that would be established (hopefully!)
  
• Make sure that a ppp device comes up. It is useful to have a "tail -f" running on /var/log/messages all this while as a debugging aid.
  
• Drop to the shell on the Empeg (either through a serial connection, or by logging in if your Empeg is configured for remote logins).
  
• Make sure the appropriate ir devices (/dev/ircomm0, ...) exist in /dev. If they don't, you need to create them. One way is to do a "tar -cpf" on Linux 1 and "tar -xpf" it on the Empeg.
  
• Run "irattach /dev/ttyS2 -s 1" on the Empeg. If things are fine, the irda0 device should come up.
  
• Execute "pppd /dev/ircomm0" on the Empeg.
  
• Count from 1 to 5. Do an "ifconfig -a" on the Empeg. If all went well, you should see the Point-to-Point link established and the IP addresses assigned.
  
• If everything is working, you can disconnect the Ethernet cable (if connected) and enjoy talking to the Empeg only over IR.
  
• Note that if the player software is restarted at this point, it should (can be made to) bind to the appropriate port (I think it is 8300) and listen on the newly found address. In other words, emplode/emptool should work over IR. [NB: I am yet to verify this.]
  

Amit Singh (amit_s@acm.org)

empeg:/# irattach /dev/ttyS2 -s 1

1.1 Tue Nov  9 15:30:55 1999 Dag Brattli

empeg:/# IrDA: Registered device irda0

irmanager is not running!

sh: -c: line 1: syntax error near unexpected token `(none)'

sh: -c: line 1: `echo (none) > /proc/sys/net/irda/devname 2>&1'

cat /proc/net/irda/discovery 

IrLMP: Discovery log:



name: Leo, hint: 0x8204, saddr: 0xb4a1075b, daddr: 0x00000b9f



empeg:/# irmanager is not running!

irmanager is not running!

IrLAP, no activity on link!