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

[Denis Kenzior <denkenz@gmail.com>]

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Hi Christopher,

On 08/28/2012 10:19 AM, Christopher Vogl wrote:
> Hi Denis,
>
> On 23/08/12 19:37, Denis Kenzior wrote:
>> 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?
>
> Telit support was so kind to send me a firmware version (08.01.108-B006)
> which supports +CFUN without resetting.
> I suppose this is not an official version yet and if I adapt the code in
> the telit plugin I will probably be the only one who can use it.
> Is it ok if I send a corrected version of this patch and change the
> offline/online mode handling in a further patch when it is sure
> supported by an official firmware version?
>

Just send it in, their official docs do mention the reset parameter, so 
if the modem rejects it then that is a firmware bug.  The end-user will 
have to upgrade the firmware in that case.

Regards,
-Denis