Re: [PATCH] telit: sim status notification without polling

[Denis Kenzior <denkenz@gmail.com>]

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Hi Christopher,

>> Also, one other thing I'm concerned about is the CFUN=4 usage when we
>> try to set the modem offline. Your comments indicate that the Telit
>> modem resets the SIM when we issue CFUN=4. Going from Online True ->
>> False we don't actually want to reset the SIM. Does CFUN take an extra
>> parameter to turn SIM reset off by any chance?
>
> Telit documentation says that +CFUN supports a second parameter which
> should turn reset off.
> AT+CFUN=? also returns +CFUN: (0,1,2,4,5),(0)
> AT reference manual: "reset flag 0 - do not reset the ME before setting
> it to <fun> functionality level"
>
> But the modem keeps returning +CME ERROR: 4 when I try it (no matter
> which CFUN level).

That is funny.  Maybe the modem does not support a true 'offline' or 
'airplane' mode.  In which case the driver might need to be modified 
somewhat.

This is something we will need to solve in the future.  If not fixed, 
I'm guessing that going Online then Offline will reset the SIM and cause 
all kinds of funny behavior.

>
> The modem behaves very strange sometimes. I kept getting timeouts when
> setting AT+CFUN=4. I once tried it manually and it took 26 seconds until
> I got an OK.
> Currently it works fine again.
>

Is there a newer firmware available by any chance?

Regards,
-Denis