Re: Modem Manager stuck in a loop, ppp can't connect.

[Dan Williams <dcbw redhat com>]

On Sat, 2017-05-06 at 18:16 -0400, A. F. Cano wrote:
> On Thu, May 04, 2017 at 09:14:01PM -0500, Dan Williams wrote:
> > On Sun, 2017-04-30 at 17:26 -0400, A. F. Cano wrote:
> > > I had a similar problem back in January which was discussed in
> > > the
> > > thread with title: "Network manager auto-upgraded, ppp no longer
> > > connects."
> > >
> > > All the information about the device, AT commands and responses
> > > can
> > > be
> > > found there, as requested by Dan Williams.  Something was
> > > apparently
> > > fixed and Modem Manager went back to working correctly.
> >
> > I don't think I was able to fix anything, so it must be something
> > in
> > the device.  The logs are the same problem as before, the device
> > isn't
> > returning a valid SID/NID for AT+CSS and thus we cannot figure out
> > if
> > we're registered on the network or not, and thus whether we can
> > connect.
>
> Mmm...  This is puzzling.  The only thing that changed was an upgrade
> of
> network-manager/modem-manager in the previous installation.  Then
> that
> installation (system on an SD card) became unusable (unrelated
> problem)
> and I installed a new system on a new SD card and it didn't work,
> again.
> Your answer prompted me to try again and, surprisingly, it now works
> correctly again.

Does the modem reply to AT+CSS with valid SID/NID values now, or still
"?, 0"?

Dan

> > Just having service (eg, "AT+CSS: 1") isn't enough, because in the
> > CDMA
> > systems you'll almost always connect to the network for emergency
> > calls, even if you cannot initiate a data connection.
>
> Thank you for the clarification.  I now understand better what
> modem-manager is trying to do and the likely bugs/limitations of this
> old phone.
>
> > I'd be pretty curious what made things work again, if you have any
> > command traces from that time?
>
> Not specific log file entries but the version of network-manager on
> the
> old system (where it worked, then didn't and then worked again) was
> 1.4.something.  The new installation was 1.6.something, but this is
> probably coincidental since this one is now working also and I'm
> pretty
> confident that the phone software is buggy.  It sometimes reboots
> itself, other times after a data session I have to power cycle the
> phone
> or voice calls can't be made, and I think the charging sofware is
> also
> buggy and is slowly ruining the battery by overcharging, but maybe
> the
> battery is just old.
>
> In any case, thank you for replying.
>
> > ...
>
> Augustine
>
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