SIM hot swap

[Ben Chan]

I've been looking into the feasibility of supporting SIM hot swap on a MBIM
modem.

If ModemManager observes MBIM_CID_SUBSCRIBER_READY_STATUS notifications, it
should be able to detect when the SIM is removed, and then put the modem in
the disabled state. If ModemManager continues to
monitor MBIM_CID_SUBSCRIBER_READY_STATUS notifications, it should be able
to detect when the SIM is re-inserted. ModemManager will need to recheck if
the SIM is PIN locked when it tries to re-enable the modem. Does it make
sense?

I guess handling the re-insertion of SIM may not be straightforward due to
the way that ModemManager currently handles PIN unlock (during
initialization and not enabling) and monitors unsolicited events (only when
the 3GPP interface is enabled). It may still be useful to handle the SIM
removal.

Thanks,
Ben
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