Restrict modem (EC21) one of 3G or 4G - ModemManager 1.10.0 (Debian Buster)

[Aleksander Morgado]

> This may be a known issue with QMI modems where the internal network
> registration attempt is done with "QMI NAS Register In Network"; this
> command not only registers in network, it also makes the access tech
> preference fallback to "any", and MM doesn't consider that in its API.
>
> There is a recent patch to avoid this, by avoiding the use of "NAS
> Register in Network" and use "NAS Set System Selection Preference"
> instead: https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/commit/c70b3557184fdf1472ff0cb36e9fd937cc7f9024
>
> That patch is not yet in any release, though, not even in 1.14.0. I'll
> backport it to the 1.14.x branch so that it gets into 1.14.2.
>
>
> So the 64 million dollar question is when is 1.14.2 likely to be released ?
>

Sometime in the next few weeks I'd say.

> I don't even see a 1.14.1 in the `mm-1-14` branch, apart from the post-release version bump.

I need to go cherry-pick fixes from git master, and that will become
1.14.2 later on. There is no 1.14.1 release per se, that is just an
indication that the branch is not closed before the 1.14.2 release.

-- 
Aleksander
https://aleksander.es