Hello Denis,
Wow, that was it exactly! After initialising with AT&C0, the serial data
connection isn't closed anymore. Never thought that the close would
originate from the modem!
Many thanks for your help & greetings August
Am 2012-06-19 10:30, schrieb Denis Kenzior:
Hi August,
On 06/21/2012 05:51 AM, August Mayer wrote:
Hello,
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 data
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.
Regards,
-Denis
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