QMI errors om Telit LM960A18 after reset

[Alex Ballmer]

On Tue, 25 Feb 2020 14:12:33 +0100
Aleksander Morgado <aleksander at aleksander.es> wrote:

> Hey,
> 
> >
> > I have been trying to use a Telit LM960A18 using ModemManager 1.12.6
> > using libqmi 1.24.4 on a router running openwrt. I have been
> > experiencing instability some time after the modem is reset.
> > Sporadically after one or more resets, the modem will refuse to
> > connect or reset. Resets have no effect, while attemping to bring
> > up the wwan network interface for the modem results in
> >
> >  daemon.notice netifd: wwan (8476): error: couldn't connect the
> > modem:
> > 'GDBus.Error:org.freedesktop.libqmi.Error.Protocol.InvalidTransition:
> > Couldn't set operating mode: QMI protocol error (60):
> > 'InvalidTransition''
> >
> > being printed in syslog. This failure persists after a warm reboot.
> > In order to fully reset the modem a hard power cycle of the board is
> > required.
> >
> > Is this something that can be worked around in libqmi or is it
> > entirely the modem's fault?
> 
> I think we need to see ModemManager debug logs to try to understand
> how the transition to online mode is failing. Would you be able to get
> those while the issue is reproduced?
> 

Attached debug logs from modemmanager
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