Re: Re-activating a context.

[Chrisopher Vogl <christopher.vogl@hale.at>]

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Hi Guillaume and Denis,

<snip>

>> pppcp_initialize_restart_count: current state 6:REQSENT
>> Jan  1 01:20:21 mx31tt01 daemon.info ofonod[810]: PPP: ipcp: 
>> pppcp_send_configure_request: current state 6:REQSENT

>> Jan  1 01:20:21 mx31tt01 daemon.info ofonod[810]: Aux: < \r\n+CGEV: ME 
>> DEACT IP, , 1\r\n

> It seems IP Control Protocol is failing so that modem cannot receive the 
> IP configuration from the network.
> IP phase is deactivated by the modem itself.
> I don't know what is happening there.

<snip>

> Although ConnMan is correctly waiting for the modem to be attached to 
> the network before trying to reconnect, maybe modem is not internally 
> ready to reconnect. The reason might be PPP session ending is initiated 
> by oFono core and not the modem itself.
> With Huawei modems we also noticed that automatic reconnection was 
> sometime failing also. But testing conditions were not the same as we 
> could not disconnect the antenna.
> Anyway I am not a PPP expert but something wrong is happening between 
> the network and your modem because not IP configuration is sent by the 
> network.


I now know why I receive '+CGEV: ME DEACT IP, , 1\r\n'.
According to Telit support this happens because the context does not get deactivated
and ofono is trying to request a new IP address although the previous one is still valid.

After the antenna gets disconnected, the modem sends '+CREG: 2' and '+CGREG: 2'.
In consequence drivers/atmodem/gprs-context.c:telit_gprs_detach_shutdown() is called to end ppp connection and
'AT+CGATT=0' is sent.
'AT+CGATT=0' should normally deactivate all active contexts, but it returns '+CME ERROR: 30'.
When I try to deactivate the context with +CGACT like ifx does in
drivers/ifxmodem/gprs-context.c:ifx_gprs_deactivate_primary(), then I get '+CME ERROR: 0' (phone failure).

Furthermore I thought that when I receive 'NO CARRIER' at least then all context should be deactivated.
From a Cinterion manual (as the Telit manual is very poor):
"If the TE wants to close the LCP link the MT may perform an LCP termination request procedure on PPP level.
After this LCP termination procedure the MT deactivates the PDP context automatically and the MT returns to
V.250 command mode and issues the final result code NO CARRIER."

I don't know if this is a firmware or ofono issue as I don't know how this should be handled correctly.


Regards,

Christopher






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