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Old 01-21-2009, 05:23 AM   #1
Peter333
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Registered: Jan 2009
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Runnig chat separately from pppd


Hi,
I'd like to run chat separately from pppd. Normally it is called internally from pppd when "connect" parameter is used in pppd config file.
Chat is started with help of fork() in pppd source code and it seems that there is new process created with redirected input/output to /dev/ttyS0.
How can I start chat and how can I dedicate which port to use for modem connection in shell command line ?

Peter
 
Old 01-22-2009, 09:19 AM   #2
TB0ne
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Registered: Jul 2003
Location: Birmingham, Alabama
Distribution: SuSE, RedHat, Slack,CentOS
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Quote:
Originally Posted by Peter333 View Post
Hi,
I'd like to run chat separately from pppd. Normally it is called internally from pppd when "connect" parameter is used in pppd config file.
Chat is started with help of fork() in pppd source code and it seems that there is new process created with redirected input/output to /dev/ttyS0.
How can I start chat and how can I dedicate which port to use for modem connection in shell command line ?

Peter
How about using minicom instead? Let's you talk directly to a serial/modem port, no PPP involved.
 
Old 01-23-2009, 02:20 AM   #3
Peter333
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Registered: Jan 2009
Posts: 4

Original Poster
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Hi,

to use minicom is problem, because it must be functional in several different Linux distributions, chat is present in all of them, minicom not.
But I found temporary solution, I am using simple shell script which uses:
echo -e "AT+COMMAND>\r" > /dev/ttyS0
But it should be perfect to have something more inteligent for example chat, because it also investigates modem responses and returns success/fails on finishing.
If somebody is master of shell scripts, it should be great to know ho to do it
:-)


Peter
 
Old 01-23-2009, 09:13 AM   #4
TB0ne
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Registered: Jul 2003
Location: Birmingham, Alabama
Distribution: SuSE, RedHat, Slack,CentOS
Posts: 26,455

Rep: Reputation: 7930Reputation: 7930Reputation: 7930Reputation: 7930Reputation: 7930Reputation: 7930Reputation: 7930Reputation: 7930Reputation: 7930Reputation: 7930Reputation: 7930
Quote:
Originally Posted by Peter333 View Post
Hi,

to use minicom is problem, because it must be functional in several different Linux distributions, chat is present in all of them, minicom not.
But I found temporary solution, I am using simple shell script which uses:
echo -e "AT+COMMAND>\r" > /dev/ttyS0
But it should be perfect to have something more inteligent for example chat, because it also investigates modem responses and returns success/fails on finishing.
If somebody is master of shell scripts, it should be great to know ho to do it
:-)


Peter
Well, minicom does run on any distro, although it may not be installed by default on all of them.

There may be scripts already written to do what you'd like, but it will be problematic for different systems, which sounds like what you're going for. If people have modems on different ports, or USB modems, all those will be different. Add to that folks who may have devices (printers? Console terminal?), plugged into serial ports, and burping out modem-check strings could cause bad things to happen.
 
  


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