Re: NetworkManager autoconnect

[poma <pomidorabelisima gmail com>]

On 04.06.2015 02:37, Tony Espy wrote:
> On 06/03/2015 04:24 PM, Pieter Cardoen wrote:
> > I've tested it with WiFi but I also need to know the behaviour of the
> > wwan case. WiFi scanning interval was set to 10 seconds. I'll try it
> > again tomorrow and verify the scan interval in advance.
> >
> > The WPA_supplicant application has the possibility to set the autoscan
> > argument to periodic or to exponential. Could it possibly be that the
> > exponential setting is enabled which causes to the reconnect period to
> > rise to a large time?
> >
> > In case of the wwan connection, you spoke about 'a couple minutes'. Is
> > it possible to adapt this time or to know wat happens more exactly?
>
> I've actually been working with the code (NM_POLICY) that causes this 
> timer to be set for wwan connections, so if you don't mind, I'll add 
> what I've learned recently.
>
> I'm currently working with patched version of NM 0.9.10.0 ( see [1] for 
> details ) as part of Ubuntu 14.10 base images we run on Ubuntu phones. 
> We have a new set of patches that implement ofono support for 
> NetworkManager, which to date has only been tested with the rilmodem 
> ofono drivers used on Ubuntu phones.

How is the AccessPoint (AP) infrastructure mode implemented on Ubuntu phones?


> I'm actually been looking at a bunch of scenarios that cause our devices 
> to hit the autoconnect_retry limit of the modem connection.  When the 
> retry limit is hit, NM_POLICY sets a 5m timer-based callback to reset 
> the connection.  When the timer fires, the associated callback function 
> resets the connection's autoconnect_retry_count, and kicks off a new 
> activation attempt.
>
> I'm not sure if this is similar to what you're seeing, as I assume 
> you're using NM with modem-manager, but it sounds very similar to the 
> behavior we see with ofono.
>
> [ Dan, one suggestion I have for this behavior, besides maybe kicking up 
> the retries_count, would be to introduce a slight delay ( 2-5s ) between 
> retry attempts for a device ( maybe just for wwan devices? ).  We could 
> possibly extend NM_SETTING_CONNECTION and make the delay a new property. 
>   I'm working on a patch that implements this idea. ]
>
> Note - one scenario that can trigger this behavior for us is enabling 
> FlightMode, as ofono will disconnect any GPRS connections it's 
> established before signaling that it's gone offline.
>
> >  > On Wed, 2015-06-03 at 16:11 +0200, Pieter Cardoen wrote:
> >  > > Dear
> >  > > While network testing, I've noticed that NetworkManager
> > automatically connects to a network if its available. However when it
> > isn't available, I've noticed that NetworkManager stops trying to
> > connect. What's the reason of this and how could I make NetworkManager
> > unconditionally try to connect to the network until the end of time?
> >  >
> >  > NM will attempt to reconnect when specific events occur, like new scan
> >  > results or a carrier change. So the answer to your question depends on
> >  > what kind of interface you're talking about.
>
> [...]
>
> >  > However, WWAN autoconnect happens continuously because WWAN doesn't have
> >  > quick/easy event notifications (scans take minutes and interrupt
> >  > connectivity, plus some modems only start registration when you ask them
> >  > to connect). This means that whenever there is a WWAN autoconnect
> >  > connection, NM will attempt the connection if the modem is not in
> >  > Airplane mode. If the attempt fails, NM will retry after a couple
> >  > seconds,
>
> Note, if nothing else is happening device-wise ( ie. WiFi isn't enabled 
> ), I see NM retry the ofono connection three times within the span of a 
> single second, zeroing the connection's autoconnect_retries immediately.
>
> Regards,
> /tony
>
> [1] 
> https://code.launchpad.net/~phablet-team/network-manager/vivid-phone-overlay
>
>
>
>
>
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