FCC authentication with QMI over MBIM; try 1

[Dan Williams]

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