QMI via MBIM for "FCC Authentication" fix

[Bjørn Mork]

Collin McMillan <cmc at nd.edu> writes:

> Wait, hold that thought.  I made a silly mistake!  I was sending 0x555B,
> when it should be 0x555F.  Relevant part of the new transaction log:

Yes, I should have made it clearer that my trace was simply the example
I had, and not the command you needed.


> Sent to modem 0x555F request
>
> 03 00 00 00 3D 00 00 00 07 00 00 00 01 00 00 00 00 00 00 00 D1 A3 0B C2 F9
> 7A 6E 43 BF 65 C7 E2 4F B0 F0 D3 01 00 00 00 01 00 00 00 0D 00 00 00 01 0C
> 00 00 02 14 00 01 00 5F 55 00 00
>
> Response recieved from modem
>
> 03 00 00 80 44 00 00 00 07 00 00 00 01 00 00 00 00 00 00 00 D1 A3 0B C2 F9
> 7A 6E 43 BF 65 C7 E2 4F B0 F0 D3 01 00 00 00 00 00 00 00 14 00 00 00 01 13
> 00 80 02 14 02 01 00 5F 55 07 00 02 04 00 00 00 00 00
>
>
> After this, it is necessary to reset the device (software detach and
> reattach via USB authorized flag worked fine).  Then, I am able to
> connect!  Finally!
>
> I will clean up my code and make a utility available for anyone else having
> this problem.  Then I'll work on integrating it into libqmi to create a
> "MBIM layer" for QMI commands.

Great!

FWIW, the 0x555B response you got can be decoded as:

 01 25 00 80 02 03 02 06 00 5B 55 19 00 => header, message etc
 02 04 00 00 00 00 00                   => status TLV, OK
 10 01 00 0E                            => current USB comp is 14
 11 0B 00 0A 01 06 07 08 09 0A 0B 0C 0E 13
    => 10 supported compositions:  1, 6, 7, 8, 9, 10, 11, 12, 14 and 19

That list is a bit unexpected to me, showing that I certainly don't
understand how all this works. I didn't expect "1" since that is usually
"HIP  DM    NMEA  AT    MDM1  MS" AFAIK.  But I guess it means something
different in this modem.  And I don't understand why 15, 16, 17 and 18
are missing since they are only dual-mode combinations of modes 6 to 12.

It's very useful to get this kind of info from different modems, since
we have to guess how the firmware works. There are obviously still a few
pieces missing.


Bjørn