Quectel EC21-A fails with new and freshly activated Twilio SIM card

[Zahari Petkov]

Thanks a lot for the response! This confirms what I have been thinking by
looking at the logs, since all indications pointed to a firmware issue. We
will check whether there is a newer firmware available, which could
possibly fix the issue.

Best,
Zahari

On Thu, May 14, 2020 at 5:42 PM Aleksander Morgado <aleksander at aleksander.es>
wrote:

> Hey!
>
> On Thu, May 14, 2020 at 4:36 PM Zahari Petkov <zahari at balena.io> wrote:
> >
> > Hi,
> >
> > We are facing an issue with a Quectel EC21-A module and Twilio SIM cards
> using ModemManager v1.12.8. I found similar error logs with Soracom SIM
> cards and other Quectel modems as well.
> >
> > A new and freshly activated Twilio SIM card would not work unless the
> modem is reset. Rebooting does not make the issue go away. After the modem
> is reset the SIM card start working. IPv6 is disabled.
> >
> > The non-verbose logs are:
> >
> > ```
> > May 13 16:54:07 f79fae5 ModemManager[1139]: Simple connect started...
> > May 13 16:54:07 f79fae5 ModemManager[1139]: Simple connect state (4/8):
> Wait to get fully enabled
> > May 13 16:54:07 f79fae5 ModemManager[1139]: Simple connect state (5/8):
> Register
> > May 13 16:54:07 f79fae5 ModemManager[1139]: Simple connect state (6/8):
> Bearer
> > May 13 16:54:07 f79fae5 ModemManager[1139]: Simple connect state (7/8):
> Connect
> > May 13 16:54:07 f79fae5 ModemManager[1139]: Modem
> /org/freedesktop/ModemManager1/Modem/0: state changed (registered ->
> connecting)
> > May 13 16:54:08 f79fae5 ModemManager[1139]: error: couldn't start
> network: QMI protocol error (14): 'CallFailed'
> > May 13 16:54:08 f79fae5 ModemManager[1139]: call end reason (1):
> 'generic-unspecified'
> > May 13 16:54:08 f79fae5 ModemManager[1139]: verbose call end reason
> (3,2504): [cm] invalid-sim-state
> > May 13 16:54:08 f79fae5 ModemManager[1139]: Modem
> /org/freedesktop/ModemManager1/Modem/0: state changed (connecting ->
> registered)
> > ```
> >
>
> Interestingly, I recently found one issue exactly like that with a
> Quectel EG06-E. I believe I was able to recover the connection putting
> the modem in low power mode (mmcli --disable and then mmcli
> --set-power-state-low) before trying to reconnect again, but I'm not
> completely sure, I didn't take note of what I did or didn't do.... In
> my case, though, it didn't happen on a fresh module boot, I think the
> setup got in that state after a lot of time being already connected.
>
> I do remember that I tried to debug the problem and gather e.g. QMI
> UIM card status info and such, and everything looked correct to me. It
> does look like a firmware bug, if you ask me...
>
> --
> Aleksander
> https://aleksander.es
>
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