FCC authentication with QMI over MBIM; try 1

[Stefan Armbruster]

@Aleksander: see the modem-manager debug logfile at
http://pastebin.com/4eyg9ZKk - please let me know if that is
sufficient or if you need something else.
I've disabled modem-manager in systemd, did a cold boot and
"ModemManager 2>&1 | tee modemmanager.log"

@Dan/@Björn: thanks for clarifying regarding GSM/GPRS/EDGE capabilities.

Cheers,
Stefan

2016-06-11 0:48 GMT+02:00 Dan Williams <dcbw at redhat.com>:
> On Fri, 2016-06-10 at 14:31 -0700, Aleksander Morgado wrote:
>> On Fri, Jun 10, 2016 at 11:57 AM, Bjørn Mork <bjorn at mork.no> wrote:
>> >
>> > >
>> > > On a unrelated note: my 4G signal is rather poor. Mobile phone
>> > > typically flips back and forth between 2g and 3g. I have the
>> > > feeling
>> > > that the Sierra modem does not really fall back to 2g. The
>> > > connection
>> > > is established very fast and reproducible, I do get IP address
>> > > assigned, but it seems that I'm only sending out packets but
>> > > don't
>> > > receive anything.
>> > >
>> > > Changing to outdoors changed behaviour that I get traffic in both
>> > > directions.
>> > >
>> > > Is there a way check if degradation to 3g or 2g is properly
>> > > working?
>> > I'll let Aleksander answer that, since I'm not really sure...
>> >
>> Well... we could try QMI commands to set preferred mode with
>> QMI-over-MBIM, now that we're at it...
>>
>> >
>> > Just wanted to note that the EM7455 doesn't support 2g at all.  It
>> > is
>> > 3g/lte only.
>> What!!?
>
> Confirmed in the data sheet.  No supported bands listed under
> GSM/GPRS/EDGE.
>
> https://www.sierrawireless.com/-/media/iot/pdf/datasheets/sierrawireless_airprime_em_series_datasheet.pdf
>
> Dan