oFono support for the Telit GC864-QUAD V2 serial port GSM/GPRS modem

[Markus Hubig <mhubig@imko.de>]

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Hello @all,

I'm new here and I'm in the process of developing a Embedded Linux datalogger
appliance. At the moment I'm evaluating the modem part of it, and we are
looking forward to use the Telit GC864-QUAD V2 serial port GSM/GPRS modem with
oFono.

Unfortunately I couldn't find much "getting started" information for oFono, but
by reading throughout the old posts on this list I gathered at least some.
Please correct me if I get things wrong:

1. The one-and-only way to tell oFono to use a modem is by udev rules like
   this:

    KERNEL=="ttyUSB0", ENV{OFONO_DRIVER}="calypso"

2. Serial port GPRS modems like the Telit GC864 are not supported
   out-of-the-box, so one has to write a special modem driver for it.

3. Since this modem supports CMUX multiplexing with the 3GPP 27.010 standard,
   I can use 'GAtMux' like it's done in 'plugins/calypso.c'.

4. There is a telit modem driver, but this is only for the UC864 UMTS modem
   which is connected via USB.

So in order to write a driver to support the GC864, what would be a good
starting point? Add support for serial port CMUX to the telit driver?

Looking forward for some advice ...

Cheers, Markus