Disconnection issues after long periods of inactivity

[Dan Williams]

On Mon, 2016-05-02 at 18:29 +0200, José  wrote:
> This is using the Cinterion PLS8-X using QMI.

Which ModemManager version?  Also, do you know if you get any
indications from the modem during that time that could indicate a
disconnect, but that MM ignores?  One that comes to mind is:

https://cgit.freedesktop.org/ModemManager/ModemManager/commit/?id=80ce59385fb0bc24f9167f339d5673ede735e1c3

MM debug logging should print out the indication, even though MM
doesn't handle it until this patch.

Dan

> On Mon, May 2, 2016 at 6:25 PM, Dan Williams <dcbw at redhat.com> wrote:
> > 
> > On Mon, 2016-05-02 at 10:43 +0200, José  wrote:
> > > 
> > > Hi,
> > > 
> > > this is an issue I am currently having on a Android system using
> > > the
> > > manufacturer RIL, and although I have also seen it using linux
> > > and
> > > modemmanger, is more of a general cellular network question.
> > > 
> > > When being inactive for a long period (~24 hours) seems like the
> > > connection goes down. The connectivity seems lost (trying to load
> > > a
> > > webpage of ping a domain fails) but the modem seems active and
> > > connected. In this state, when pinging directly to an IP I get
> > > outputs
> > > similar to the following:
> > > 
> > > PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
> > > 
> > > From 100.82.203.31: icmp_seq=1 Destination Host Unreachable
> > > 
> > > --- 8.8.8.8 ping statistics ---
> > > 
> > > 1 packets transmitted, 0 received, +1 errors, 100% packet loss,
> > > time
> > > 0ms
> > > 
> > > Can any of you explain what exactly happens? Thanks
> > What kind of modem is this, and is it PPP-based?
> > 
> > Dan
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