[Gta04-owner] Modem closes serial line after active calls (sometimes)

[Simon Busch]

Heyho,

I am testing currently the FSO GSM daemon if every functionality works
as expected. While making some outgoing calls and accept incoming ones I
discovered that after some time I get a HUP signal from the modem.

Like in this case where response for +CEER comes in but directly after
that the serial lines (both ttyHS_Application and ttyHS_Modem) gets the
HUP signal:

libfsotransport <fd -1>: SRC: "+CLCC" -> [ "OK" ]
Gtm601Modem <>: Did receive a valid response for FsoGsmPlusCLCC
FsoGsmGenericAtCallHandler <>: 0 calls known in the system
FsoGsmGenericAtCallHandler <>: call status idle -> stopping updater
libfsotransport <fd -1>: Attemping to write next command to transport;
we have 1 commands pending!
libfsotransport <fd -1>: Wrote '+CEER'. Waiting (5s) for answer...
libfsotransport <Serial /dev/ttyHS_Application at 115200 (fd 22)>:
WriteCallback called with 9 bytes in buffer
libfsotransport <Serial /dev/ttyHS_Application at 115200 (fd 22)>:
WriteCallback wrote 9 bytes
libfsotransport <fd -1>: SRC: "+CEER" -> [ "+CEER: Client ended call",
"OK" ]
Gtm601Modem <>: Did receive a valid response for Gtm601ExtPlusCEER
libfsotransport <Serial /dev/ttyHS_Application at 115200 (fd 22)>: HUP =>
closing channel
libfsotransport <Serial /dev/ttyHS_Application at 115200 (fd 22)>: Closing...
libfsotransport <Serial /dev/ttyHS_Application at 115200 (fd -1)>: Closed
libfsotransport <fd -1>: HUP from transport; signalling to upper layer
libfsotransport <Serial /dev/ttyHS_Modem at 115200 (fd 23)>: HUP => closing
channel
libfsotransport <Serial /dev/ttyHS_Modem at 115200 (fd 23)>: Closing...
libfsotransport <Serial /dev/ttyHS_Modem at 115200 (fd -1)>: Closed
libfsotransport <fd -1>: HUP from transport; signalling to upper layer

Does anybody has seen this before or know whats causing the modem to
close the lines (modem is still up, lsusb lists it as normal)?

regards,
Simon

-- 
Simon Busch - http://mm.gravedo.de/blog/