FCC authentication with QMI over MBIM; try 1

[Stefan Armbruster]

Aleksander,

HW is a Thinkpad X1 Yoga equipped with a Sierra ID 1199:9079. System
is a Ubuntu 16.04 with ubuntu mainline 4.6.2 kernel.
I've built locally debian packages for libmbim, libqmi and
modemmanager - each based on qmi-over-mbim branch. I've used the stock
version shipping with the distribution and followed the "new upstream
release" workflow from the Debian New Maintainers Guide
(https://www.debian.org/doc/manuals/maint-guide/update.en.html#newupstream)

To have cleaner environment for testing I've disabled
activation/deactivation e.g. of WWAN when WIFI is connected and vice
versa or upon docking/undocking  in TLP.

I have not done enough testing but it seems to work so far. I've cold
booted the machine and got  "power state: on" on `mmcli -l 0` - so fcc
auth seems to be done. After a suspend/resume cycle I also got a
connection to my mobile provider.

Please let me know if you need any debugging output or if I can help
in any other way.

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?

Cheers,
Stefan

2016-06-07 6:25 GMT+02:00 Aleksander Morgado <aleksander at aleksander.es>:
> Hey,
>
> I've pushed several updates to the "qmi-over-mbim" branches in all
> libqmi, libmbim and ModemManager. Totally untested, so please someone
> try to get a run with a MBIM modem that requires the FCC auth command
> with ModemManager --debug.
>
> I don't expect a successful run with this first version, but debug
> logs or even patches on top of the branches will definitely help.
>
> Some notes:
>  * First, build and install libmbim.
>  * Second, configure libqmi with --enable-mbim-qmux, build it and
> install it. (the configure option is now set to "auto", so if you
> already have libmbim installed, the explicit --enable-mbim-qmux may
> not be needed).
>  * Third, build ModemManager and install it.
>
> I added the FCC auth try when the modem tries to get online; if it
> fails, it will try the fcc auth logic via QMI (hopefully, as I said,
> untested), and then retry to go online. As said, don't worry if it
> doesn't work yet, bug logs welcome.
>
> --
> Aleksander
> https://aleksander.es
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