I'm using a Quectel EC21 modem on a Debian Buster Linux system (using
modemmanager 1.10.0).
I want to force it to one of 3G or 4G to stop it changing/swapping
between the two.
I've tried using the `mmcli -m 0 --set-allowed-modes=3g
`. mmcli seems happy with that.
# mmcli -m 0
--------------------------------
Modes | supported: allowed: 3g; preferred: none
| allowed: 4g; preferred: none
| allowed: 3g, 4g; preferred: 3g
| allowed: 3g, 4g; preferred: 4g
| current: *allowed: 3g; preferred: none*
--------------------------------
and the modem connects using 3G (umts).
--------------------------------
Status | lock: sim-pin2
| unlock retries: sim-pin (3), sim-pin2 (3),
sim-puk (10), sim-puk2 (10)
| state: connected
| power state: on
| access tech: *umts*
| signal quality: 57% (recent)
--------------------------------
However, some time later it swaps over to 4G (lte)
--------------------------------
Status | lock: sim-pin2
| unlock retries: sim-pin (3), sim-pin2 (3),
sim-puk (10), sim-puk2 (10)
| state: connected
| power state: on
| access tech: *lte <<< 4G !!!*
| signal quality: 63% (recent)
--------------------------------
Have I got the right expectations of the `--set-allowable-modes` feature?
Is there something else I need to do?
Does this feature work with MM 1.10.0 ?
I did see some forum discussions about it not working and also patches,
but I can't quite figure out whether that was pre or post v1.10.0.
There is a backport of MM 1.14.0 which I could try. Is a later version
likely to help?
The MM changelog/news file doesn't seem to suggest there is an issue or fix.
I did find this in the git commits, but not sure if it is relevant or not.
*policy: Use SetCurrentModes instead of SetAllowedModes
*
There is no DBus API for SetAllowedModes, but only for
SetCurrentModes. (cherry picked from commit
e21e7ddfae3d68418ad9c6f4d589b720b7b85b8b
<https://cgit.freedesktop.org/ModemManager/ModemManager/commit/?id=e21e7ddfae3d68418ad9c6f4d589b720b7b85b8b>)
author Mohammed Sadiq <sa...@sadiqpk.org> 2019-09-24 19:10:29
+0530
committer Aleksander Morgado <aleksan...@aleksander.es> 2019-09-25
13:38:50 +0200
commit b34203b1b8e8676bb686f0c33ba3104c8577b855
<https://cgit.freedesktop.org/ModemManager/ModemManager/commit/?h=mm-1-10&id=b34203b1b8e8676bb686f0c33ba3104c8577b855>
(patch
<https://cgit.freedesktop.org/ModemManager/ModemManager/patch/?id=b34203b1b8e8676bb686f0c33ba3104c8577b855>)
tree 80a501b5eae527399c783a2c09e84e1d5b86fe02
<https://cgit.freedesktop.org/ModemManager/ModemManager/tree/?h=mm-1-10&id=b34203b1b8e8676bb686f0c33ba3104c8577b855>
parent 00c0911cb2e0e4558d98f4fe5085cd2be89f9ec3
<https://cgit.freedesktop.org/ModemManager/ModemManager/commit/?h=mm-1-10&id=00c0911cb2e0e4558d98f4fe5085cd2be89f9ec3>
(diff
<https://cgit.freedesktop.org/ModemManager/ModemManager/diff/?h=mm-1-10&id=b34203b1b8e8676bb686f0c33ba3104c8577b855&id2=00c0911cb2e0e4558d98f4fe5085cd2be89f9ec3>)
Thanks,
Brendan.
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