HP lt4120 failing to make single-stack connections on LTE using MM

Aleksander Morgado aleksander at aleksander.es
Thu Sep 6 09:02:47 UTC 2018

On Thu, Sep 6, 2018 at 10:46 AM, Bjørn Mork <bjorn at mork.no> wrote:
> Aleksander Morgado <aleksander at aleksander.es> writes:
>> Oh wait, this is a Intel based MBIM modem, right? If so, we need
>> AT-based reset operations. I believe I still have the HPlt4120 around
>> here, will try to implement that. Tracking it here:
>> https://gitlab.freedesktop.org/mobile-broadband/ModemManager/issues/86
> Don't know if we've discussed this before, but based on testing with the
> EM7345 and looking at the Windows stuff, I believe it supports a vendor
> MBIM service usable for reset:
> UUID_FWUSVC =>  UNKNOWN (0ed374cb-f835-4474-bc11-3b3fd76f5641)
>     DssPayload: 0x00000000
>     MaxDssInstances:    0
>     CidCount:   1
>     CidList:    1
>    CID_MODEM_REBOOT   <unknown> (1)
> My notes are a bit sketchy as always, and the modem is stowed away, but
> I believe that was the only CID of that service and that it only
> supported SET requests.  With immediate modem reset as a result.

Ah, even better, thanks for the pointer :)


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