Quectel em12-g minimal kernel version

[Bjørn Mork]

Nicholas Smith <nicholas at nbembedded.com> writes:

> I can confirm that the Quectel EM12-G most certainly does not play
> nice with qmi_wwan (at least on the vendor firmware versions I have
> tested, which includes several, including the latest).  The module
> always inexplicably crashes after anywhere from between a couple of
> hours to a couple of days of uptime.  When in MBIM mode it is stable,
> but you cannot use qmicli to get detailed NAS information, or select
> bands, etc... so you lose a huge amount of useful functionality.  So,
> if I want to do anything out of the ordinary, I temporarily switch it
> into QMI mode before switching back to MBIM mode.

So it doesn't export the QMI service in MBIM mode?  That's pretty
unusual for a Qualcomm based modem.  

You can check this with e.g

 mbimcli -d /dev/cdc-wdm0  --query-device-services

We normally expect an entry like:

                         Service: 'qmi'
                             UUID: [d1a30bc2-f97a-6e43-bf65-c7e24fb0f0d3]:
                      DSS payload: 0
                Max DSS instances: 0
                             CIDs: msg (1)


This MBIM service can be used by libqmi/qmicli for full QMI access.  See
the --device-open-mbim option.  Actually, it defaults to autodetecting,
so accessing QMI services should just work.



Bjørn