Re: Re-activating a context.

[Denis Kenzior <denkenz@gmail.com>]

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Hi Christopher,

On 07/12/2012 09:50 AM, Christopher Vogl wrote:
> Hello,
>
> I am trying to simulate a connection loss and after a valid ppp
> connection I disconnect the antenna to get detached from GPRS.
> After reconnecting the antenna everything seems to work fine just until
> activating the context.
>
> Ofono seems to get stuck in
> drivers/atmodem/gprs-context.c:at_gprs_activate_primary() and
> AT+CGDCONT=1 is missing on the debug output.
> When I retry to activate the context after some minutes with a dbus-send
> call, I receive an operation in progress error.
>
> Below I have attached ofono's debug output and dbus-send calls for
> important interfaces
> - before removing the antenna
> - after removing the antenna
> - after reconnecting the antenna
>
> Modem in use: Telit UC864-G
>
> connMan in the debug output is my own simple connection manger. I am not
> sure if I missed to set some ofono state or if there is a known issue.
> I really would appreciate a hint in this case.
>

To me it looks like your PPP connection has not been dropped when the 
antenna has been removed.  Today oFono assumes that the PPP connection 
will be dropped by the modem in this case, and your modem does not do 
this.  This leads to problems because the AT channel on which the PPP 
connection is being run can not accept additional commands.  This is why 
you're not seeing the CGDCONT.

A while ago Guillaume posted a patch to fix this problem (we saw this 
with Huawei PPP based devices).  The patch looked good to me but needed 
further testing (e.g. for regressions).  Can you dig the mailing 
archives and test that patch?

Or maybe Guillaume will be nice enough to repost it to the mailing list.

Regards,
-Denis