Re: no connection after ofono restart while huawei modem connected

[Denis Kenzior <denkenz@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 1466 bytes --]

Hi Christophe,

>> The best course of action would be to have modem.disable() issue a
>> CFUN=0 equivalent that resets everything properly.  If that's not
>> possible, then a solution along the lines of what you propose is
>> needed.  E.g. sending a '+++' in at_gprs_context_remove if the state
>> isn't IDLE.
> I don't have a document describing AT command supported by MS2372. I use
> a document describing AT command supported by another Huawei modem. I
> didn't find any better command than AT+CFUN=0 to try to put back PPP
> channel in command mode.

Sometimes these modules take an extra reset parameter after the CFUN. 
E.g. AT+CFUN=0,1 to reset the module completely.  Not sure if this has 
other implications.  Possibly we can issue a AT+CFUN=1,1 or AT+CFUN=4,1 
on .enable() that might fix this as well.

> I had a look at g_at_ppp_suspend and you are right, there is a guard
> timeout before sending '+++'. That's why it won't solve my problem.
> Ofono will die before this command is really sent.
> So I don't have any better idea than patch I already sent? Should I send
> a proper patch series with similar content?

That's the issue, the guard timeout is supposed to be used after all 
activity has been stopped and only then should '+++' be sent.  So it 
might be a good idea to put this behind a VENDOR guarded if-statement 
and issue the '+++' directly to the GAtIO without involving GAtPPP at all.

Regards,
-Denis