Re: ModemManager and Cinterion BGS2-W

[Dan Williams <dcbw redhat com>]

On Thu, 2013-04-11 at 15:45 +0400, Golikov Pavel wrote:
> 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.

Aleksander has more experience with the Cinterion devices than I do, but
if the device is a USB device then we could potentially use the USB IDs
to specially set up the serial port properties and send Q3.  Any idea if
the RTS/CTS and Q3 stuff is specific to this modem, or general to other
Cinterion devices?

Dan