oFono gets multiplexer support

[Denis Kenzior]

Hi All,

Just to let you know the initial support for multiplexing has been added to 
oFono.  The multiplexer infrastructure is fully customizable through the use 
of drivers.  Two drivers are currently supported, GSM 27.010 Basic and 
Advanced modes.

The multiplexer is implemented in gatmux in the gatchat library.  GAtMux 
provides a simple interface, and returns a fully functional GIOChannel for 
each multiplexer port.  Thus it can easily be integrated with the existing 
GAtChat functionality, or used to read / write raw information (e.g. ppp 
frames)

This will allow oFono to implement everything in the main oFono process, and 
not resort to a separate multiplexer daemon.  The calypso modem plugin has 
been updated to take advantage of 4 multiplexer channels.

Regards,
-Denis