Sometimes MC35i responds with "NO CARRIER" on "AT+CLIP=1". Some tests shows
that it can be an issue of "REVISION 02.00" modem firmware.
More details here see [1]

Attached file contains proposed patch. Changes summary:
1. added "NO CARRIER" and "NO DIALTONE" to the list of known error
responses (org.smslib.modem.athandler.AATHandler.terminators[2] and
org.smslib.modem.AModemDriver.rxPlainError)
2. added small TimeoutException catch to the
org.smslib.modem.AModemDriver.getResponse() to make debugging similiar
problem easier
3. altered init sequence of Siemens MC35i to try 'AT+CLIP=1' several times
(hardcoded 5 attemps with hardcoded 1200ms pause between them, should be
extracted to the Settings maybe :) ) until modem responds with 'OK' instead
of 'NO CARRIER'. Resolved this problem in my case. From what I see, these
changes should not break compatibility with supported devices.

[1] http://groups.google.com/group/SMSLib/browse_thread/thread/33c6867735aee9da

 

mc35i_no_carrier.patch 2.9 KB   Download