ModemManager and Cinterion BGS2-W

[Golikov Pavel <paullo612 ya ru>]

Hello! I'm trying to get ModemManager 7.990 working with my Cinterion modem.

The problem is that the modem cannot be enabled properly. The cinterion plugin switches it to CYCLIC SLEEP 
mode (+CFUN=7) on initial power down.
In this mode the modem can only be enabled if hardware flow control is on (RTS\CTS).
The mm-serial-port.c has property for enabling hardware flow control, but it isn't used anywhere in the code.

The other problem is that power on from CFUN=7 requires enabling hardware flow control by sending \Q3, but 
function that does it (setup_flow_control) does not get called on initial modem initialization process.

The modem in CYCLIC SLEEP also cannot be found by plugin after ModemManager startup without hardware flow 
control turned on.

What is the best way to implement hardware flow enabling? I can actualy enable it in init_power_down function 
of modem plugin, but the modem search problem still remains then.