On 06/21/2012 05:51 AM, August Mayer wrote:
When connecting again to GPRS / PPP, after an Internet connection has
been closed previously, the connection seems to fail. It looks like the
ofono_modem serial data channel is completely closed when a PPP
connection is shut down. I'm using a Telit Modem, which provides several
serial ports, and am right now using separate serials for the AT chat
and the data/PPP; for this reason, the AT chat continues working, but
the data channel is dead.
Something similar was happening on Qualcomm based modems from Huawei,
ZTE, etc. The modem was sending a HUP on the PPP channel after PPP link
was dropped. I believe the preferred solution was to send AT&C0 when
initializing that port.
My question is, is it somehow necessary to re-initialise the modem
serial channel after a PPP connection? Or could there be a conceptual
problem that I have overlooked?
This can be possible as well. See commit
7ed56d6844f8131cbf981e482b7bded8b20db7ab for another possible solution
(prior to &C0) that can be used as well.