advice needed

[Babarovic Ivica <ivica@asist-traffic.com>]

Hi!

I have a working setup with a vxworks machine sending
data over GPRS modem. It sets up a modem and establish
a ppp link with provider.

Now I have to send some additional data(pictures) which hardware
that vxworks runs on cannot provide. That's why I included a small
industrial board with framegraber an put linux on it. Basically I inserted
this linux box between vxworks box and a GPRS modem connecting
them with serial lines.

Since I need to keep vxworks setup and programs untouched  (it needs to
work as
plug in linux box, plug out linux box) I've come with a following idea.

I made a program that connects serial ports on linux board so vxworks
box can
freely access modem across linux box and initialize it. I'm catching the
"CONNECT" string here  and after that, I break the serial port
connection/exit
program. I start ppp link on serial side towards vxworks and that makes
it happy.

Now the problem comes when I want to attach to a connected stream towards
modem on linux. Remember this stream was created by vxworks box.
I thought I want be having any problems but pppd refuses to connect or
refuses to attach itself to this stream and start ppp negotiation.
I thought pppd will behave similar as when manually dialing to a provider.
Scenario: Minicom, dial, connect, exit minicom, start pppd, ppp link
comes up.

But for some reason pppd refuses this for the stream vxworks box created.

All I get in log is: pppd 2.4.3 started by root, uid 0
no further lines.

Let me add that if I kill this stream somehow(enter minicom and exit)
I can easily establish my own link from scratch. But of course this needs
to be automated. So what do you think is causing pppd not to establish
ppp link with the stream vxworks creates?


I hope I was clear enough since my English is a bit basic. If not please ask
for whatever info you need. I'll provide.


TIA,
I.B.