On 19/08/2020 2:13 am, Aleksander Morgado wrote:
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.
So it's been a while, but I now have MM 1.14.2 installed on my embedded
system via Debian Buster Backports repo.
I can successfully set the allowed mode to "3G" and get a UMTS connection.
* mmcli -m 0 --set-allowed-modes="3G"*
However, if I try to lock to 4G the connection never succeeds.
**
mmcli -m 0 --set-allowed-modes="4G"**
The only way I can get an LTE connection is with the following.
**
mmcli -m 0 --set-allowed-modes="3G|4G" --set-preferred-mode=4G**
*I presume this is a bug? But maybe there is something else going on**?**
**Any ideas or suggestions to get an LTE connection with setting 4G as
the only allowed mode?*
Also, I've just noticed that 1.14.6 has just hit the Buster Backport
repo. I'm not sure if that will help or not, but I don't see anything
in the NEWS file that would suggest a change in this area.
https://github.com/freedesktop/ModemManager/blob/mm-1-14/NEWS
Thanks, Brendan.
****
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