Re: [PATCH 0/3] Attach GPRS on demand

[Denis Kenzior <denkenz@gmail.com>]

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Hi Mika,

On 12/09/2010 02:12 AM, Mika.Liljeberg(a)nokia.com wrote:
> Hi Denis,
> 
>>> With these patches, GPRS context activation will cause oFono to
>>> automatically attempt GPRS attach if the modem is presently 
>> detached.
>>>
>>
>> Before I look at these patches: Have you considered fixing the attach
>> behavior instead?
> 
> I'm not quite sure what you mean here. There are many different cases, where the network can detach a UE from GPRS service. See possible detach causes in 24.008. Currently, oFono does not recover at all. Trying to figure out when GPRS is again available can get pretty complicated and the different detach causes require different handling. IMO, the simplest approach by far is to retry GPRS attach when someone actually needs a PDP context. 

So here's the problem, ConnMan is in charge of activating the context on
Meego.  ConnMan activates the context once we're attached.  So how do
you expect your 'on-demand' re-attach to work exactly?

Besides, 24.008 cause codes give us plenty of hints of whether / when to
re-attach, and only a few of them require 'special' handling.

I still think that we should come up with some strategy to re-attach
automatically when detached by the network.

Regards,
-Denis