Question about resetting ModemManager SIM data.

[Dan Williams]

On Wed, 2016-01-06 at 15:03 +0100, Troels Olesen wrote:
> Hi ModemManager developers.
> 
> My situation is this. I have a Sierra MC7710 Modem,
> that is connected to a external SIM card switcher.
> 
> I can switch the SIM card when the modem is in low-power state.
> But when i return the modem to high-power state after the switch,
> the SIM data stored by ModemManager is not changed.
> 
> Is there some way i can force an reinitialization of the SIM card
> data?

Does the modem give any unsolicited indication of the SIM switch?  Can
you run MM with --debug and see what QMI notifications, if any, are
emitted while in the low-power state when you switch the SIM?  If we
can get an indication of the switch, then we could trigger a re-init of
the SIM information.

It's also possible that we haven't enabled the right QMI notifications,
so you might get nothing, but that doesn't meant the modem couldn't
send something if we toggled the right message.

Dan

> I have looked at the ModemManager code, and found,
> that a modified version of the function "mm_iface_modem_initialize"
> in 
> "mm-iface-modem.c",
> might be able to reset the SIM object data, and force a
> reinitialization.
> 
> But figuring out how to do this has eluded me.
> Maybe from the function "modem_after_power_up_ready".
> 
> I would appreciate your input, about what you would consider best
> practice.
> And if there already exists a way to force a reinitialization of the 
> stored SIM data.
> And more important without rebooting the modem hardware.
> 
> Thanks in advance for any help you can give me.
> 
> Kind Regards,
> Troels Olesen
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