With some modems, the lock/unlock of the SIM-ME interface with +CSIM=1/0
command is followed by #QSS unsolicited messages. With the current
implementation, this messages are mistaken for SIM swap events and so the
modem is first dropped and then re-probed.
With this patch, the plugin takes into account the SIM-ME lock state when
parsing #QSS unsolicited, so that the QSS handler can correctly
elaborate the messages that are not related to SIM swap events.
Currently, Telit's SIM swap implementation is stateless and
based on #QSS unsolicited messages 0/1 (SIM_REMOVED/SIM_INSERTED).
However, the user might have configured the modem in order to provide a
more detailed information, with #QSS values 2/3 (SIM UNLOCKED/SIM READY).
In this case and with current implementation, even receiving "#QSS: 3" will
trigger the "SIM swap" logic. The same issue might occur in other use cases
too, i.e. with SIM locked or when the message is received from both USB
ports.
This patch makes SIM swap implementation stateful, and it considers as an
actual SIM swap, only transitions from #QSS: 0 to #QSS: 1/2/3 and vice
versa.
- Refactored mm_telit_parse_csim_response in order to correctly
recognize the following +CSIM error codes:
* 6300 - Verification failed
* 6983 - Authentication method blocked
* 6984 - Reference data invalidated
* 6A86 - Incorrect parameters
* 6A88 - Reference data not found
- Updated correspondent tests.
- Finally, some minor changes in other files for better error logging
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=100374
Carlo Lobrano
Aleksander Morgado