Hi Denis,
Thanks a lot for the reply!
>> could you please help me with the following issue. I use U-Blox
>> SARA-U270 modem. I'm able to online it and connect to GPRS using both:
>> connman and ofono-tests. The problem occurs when modem loses GSM link.
>>
>> What I did:
>>
>> - Boot board with ofono 1.18
>> - activate-context & process-context-settings
>> - ifconfig shows ppp0, everything works
>> - Disconnect physical GSM antenna, network strength becomes 0 (in
>> list-modems)
>
> I doubt that this is a good way of testing out-of-coverage conditions. You'd
> probably need a proper network simulator to do that...
>
I'm not cellular expert, so probably ask dummy things :-) what can be wrong
with such test? How it differs from, for example, going underground like metro,
or tunnel in highway?
>> - Connect antenna, network strength becomes 40
>>
>> Problem:
>>
>> After these steps, modem doesn't reconnect to GPRS, while
>> list-contexts shows correct settings:
>>
>> [ /ublox_0 ]
>> [ /ublox_0/context1 ]
>> Username = t-mobile
>> AuthenticationMethod = chap
>> Protocol = ip
>> Name = Internet
>> Settings = { Interface=ppp0 Netmask=255.255.255.255
>> Method=static DomainNameServers=10.74.210.210,10.74.210.211,
>> Address=10.23.6.118 }
>> IPv6.Settings = { }
>> Active = 1
>> AccessPointName = internet.t-mobile
>> Password = tm
>> Type = internet
>>
>> But I don't see ppp0 interface.
>
> Run oFono with AT command logging enabled as well as debugging enabled. See
> HACKING, 'Running from within the source code repository' section for
> instructions.
Yeah, I've enabled this, but there is no output. The last command was printed
when I activated context first time, IIRC it was CONNECT.
>
>>
>> An attempt to activate-context doesn't do anything, just empty output
>> (with enabled debugging).
>>
>> Attempt to deactivate-context failed with:
>>
>> Error deactivating /ublox_0/context1:
>> org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible
>> causes include: the remote application did not send a reply, the message
>> bus security policy blocked
>
> Most likely because your modem's firmware itself has crashed.
>
>>
>> The only hard modem reset helps.
>>
>> Moreover, after antenna disconnect, there is no more cellular service in
>> ConnMan. Only daemon restart helps.
>>
>>
>> How should I handle lose GSM network events to keep ppp0 up? Why ofonod
>> hangs with the steps mentioned above?
>
> oFono itself is not hung, but the underlying modem has. Remind me, is the
> SARA a serial based device or USB?
USB, it's connected using ACM Linux driver (ttyACM0-ttyACM6).
Btw: what should be the behavior, when ofono is out from cells coverage? Who
should deactivate context, ofono or modem?
Alex
>
>
> Regards,
> -Denis
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