Re: pppd and AT+WMUX(Multiplex mode)

["Miguel-Munoz" <miguelmunoz@sepsa.es>]

Continuing with the same issue...
I´m trying to do the same with the same modem.
I´m thinking in use a 'virtual' ttyS, changing the device driver.
So I would have a point where I could extarct the headers
(data or commands), almost from the port.
Am I wrong?

Thanks

Miguel

----- Original Message ----- 
From: <carlsonj@workingcode.com>
To: "Simon Chow" <simonchow@keytechsys.com.hk>
Cc: <linux-ppp@vger.kernel.org>
Sent: Wednesday, July 21, 2004 5:44 PM
Subject: Re: pppd and AT+WMUX(Multiplex mode)


> Simon Chow writes:
> > I am researching how to handle the AT packets and Data packets offered
by
> > the Wavecom GSM modem in AT+WMUX=1 mode. I want to modify the pppd
programme
> > and I think that the tty.c in pppd may be the key to change. The
charshunt
> > function manipulates both the raw bytes sent from and received by the
serial
> > port. However, I am still in an initial stage.
>
> I don't think that analysis is right.  The charshunt task is invoked
> only in a few cases (e.g., where the 'record', 'notty', or 'socket'
> options are used), and isn't the normal data path.  The normal data
> path is in the kernel, not user space.
>
> > I wonder if the pppd tool can handle the multiplex mode offered by
Wavecom
> > GSM modem. Thanks.
>
> Not today.  I think you'd have to modify the PPP modules in the Linux
> kernel to detect the switching mechanism and feed the data up to pppd
> first.  Otherwise, it'll probably be handled as bad PPP frames and
> discarded.
>
> -- 
> James Carlson                                 <carlsonj@workingcode.com>
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