Re: Access to SIM card when Modem is not "Powered"

[Denis Kenzior <denkenz@gmail.com>]

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Hi Pekka,

> Hi all,
> 
> I think the Modem "Powered" property is meant to control the radios
> (something like at+cfun=0 vs. at+cfun=1..). Now core automatically
> removes all the atoms in case modem has "Powered" false. However, the
> SIM card should be accessible while the radios are off (cfun=0) so
> that PIN code could be entered. If the +CFUN=1 is given before PIN
> code is entered, the modem registers to network in limited service
> (emergency call only) mode. Perhaps it would be better to let the
> modem driver itself decide which atoms are active when it is not fully
> powered?
> 

I've been talking about this exact issue with Marcel but so far we have not 
firmly agreed on any solution.  Our current thinking is to keep Powered 
semantics as they are, but to also add Flight mode property.  This would in 
affect allow interaction with the SIM while the radio is off.  For some modems 
it might not even make sense to support flight mode (e.g. HFP)

We're also trying to figure out how this would interact with SIM removal / SIM 
dead events.

If you have strong feelings about a particular approach feel free to discuss 
it here or on IRC.

Regards,
-Denis