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huawei: improve after-sim-unlock step with ^SIMST indications

Submitted by Aleksander Morgado

Assigned to ModemManager bug user

Link to original bug (#85053)

Description

Originally reported at: https://bugzilla.gnome.org/show_bug.cgi?id=719917 Please refer to the original bug report if more details are needed.

The Huawei plugin has already a "after-sim-unlock" step subclassed, which just waits 3s after a SIM unlock before going on with the initialization sequence (e.g. loading own numbers).

Some modems, like the Huawei K3520, may require even more time, though:

ModemManager[23814]: <debug> [1386259522.612855] [mm-at-serial-port.c:436] debug_log(): (ttyUSB2): --> 'AT+CNUM<CR>' ModemManager[23814]: <debug> [1386259522.622586] [mm-at-serial-port.c:436] debug_log(): (ttyUSB2): <-- '<CR>``<LF>+CME ERROR: 14<CR>``<LF>' ModemManager[23814]: <debug> [1386259522.622665] [mm-serial-parsers.c:364] mm_serial_parser_v1_parse(): Got failure code 14: SIM busy

The after-sim-unlock step should be improved to make sure the SIM is fully initialized before going on; either looking for SIM busy errors or checking for "^SIMST: 1" indications.

Edited by Aleksander Morgado
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