Re: Multiplexer PH8 Cinterion modem

[Denis Kenzior <denkenz@gmail.com>]

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Hi Mark,

On 06/04/2014 03:26 AM, Mark vd. Putten wrote:
> I have got a PH8 Cinterion modem.
> 
> gatmux.c        ->      g_at_mux_setup_gsm0710
> Queries the modem for available multiplex modes
> The modem only returns a list with mode 0
> 
> ofonod[7120]: Setup: > AT+CMUX=?\r
> ofonod[7120]: Setup: < \r\n+CMUX: (0)\r\n\r\nOK\r\n
> 
> This is not correctly handles by
> gatmux.c        ->      mux_query_cb
> 
> It expects another subset
> 798     /* Subset */
> 799     if (!g_at_result_iter_open_list(&iter))
> 800             goto error;
> 
> Multiplex port is on USB and therefore has no requirements on speed.

subset parameter is not about speed.  It has been a while, but I believe
we only support UIH framing mode, hence why that code checks for subset=0.

> 
> What would be the best solution in changing this?
> Hack the gatmux.c?
> 

In general GAtMux tries to make the most intelligent choice based on the
standard CMUX syntax (per 27.007).  In cases where a modem does
something different and this logic breaks down, one can always setup the
MUX manually.  Refer to plugins/ifx.c and plugins/sim900.c for examples.

Regards,
-Denis