Re: [Gumstix-users] serial over ethernet

[Nelson C. <nel...@gm...>]

On 9/25/07, Craig Hughes <cr...@gu...> wrote:
> On Sep 25, 2007, at 4:04 PM, Jason Cox wrote:
>
> > Craig,
> >       thanks of that.
> > just so I have it straight, the ::sysinit is on the client and
> > the ::respawn is on the serial port server
>
> Both of those are on the same gumstix -- the one which has the serial
> devices connected to it.  On the other end, you just open a tcp
> socket and read/write that.  You could use socat to attach a pty to
> the tcp socket if you wanted to, but I've not yet found a need to do
> that.

Hi :)

Last week I did some sniffing on a serial protocol using QEMU and
a simple serial sniffer[1] . The program evolved (it is 2 days old now)
and now I can use it to connect serial ports with UDP endpoints
(I haven't used TCP but it is easy to add it).

http://svn.arhuaco.org/svn/src/nitm/

I wrote it because I am testing serial protocols and I wanted to be able to
change the connections without restarting programs or touching cables.
I also need to see the traffic for debugging purposes.

It might be useful for someone else (It is useful to me now :) ). I guess I will
make it use TCP sockets (in client / server mode) and a configuration file
(right now you need to recompile to define the endpoints).

$ telnet localhost 5002
Trying 127.0.0.1...
Connected to localhost.localdomain.
Escape character is '^]'.


Welcome to nitm
type 'help' if you don't know what to do.

help

list -- list connections
use x y  -- Connect x and y (use 'list' first)
quit  -- disconnnect from the server

list
1 =>   CKTTY
2 => * CKUSB
3 =>   DebugClient
4 =>   UDPVM
5 => * QEMU
use 1 3
Selected : CKTTY and DebugClient
list
1 => * CKTTY
2 =>   CKUSB
3 => * DebugClient
4 =>   UDPVM
5 =>   QEMU

Regards,
Nelson.-

[1] http://wiki.freaks-unidos.net/weblogs/arhuaco/rs232-serial-sniffer

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