3gpp-set-eps-ue-mode-operation fails to set some options

[Brendan Simon]

I'm trying to use the `--3gpp-set-eps-ue-mode-operation` to set
`data-centric` or `voice-centric` modes.

I note there are 4 possible values: ps-1, ps-2, csps-1 and csps-2, with
ps-2 and csps-2 being data-centric.

My Quectel E21 modem only accepts one option; csps-2.  All other options
fail.

*What determines what options MM can or cannot set** for ue-mode ?* - is it
the modem, SIM card, network, other?

*How can I use the `--3gpp-set-eps-ue-mode-operation` option to set/change
from voice-centric to data-centric, etc.*

I would prefer not to issue AT commands (especially since Debian does not
configure MM to allow AT commands and I have to use debug mode).

Below are some annotated commands and output.

Thanks, Brendan.

--


*# mmcli -m 0 --3gpp-set-eps-ue-mode-operation=csps-1*error: couldn't set
UE mode of operation for EPS:
'GDBus.Error:org.freedesktop.ModemManager1.Error.MobileEquipment.NotSupported:
Operation not supported'


*# mmcli -m 0 --3gpp-set-eps-ue-mode-operation=csps-2*successfully set UE
mode of operation for EPS

I had set the `ue_usage_setting` to `01` according to a Quectel guide.


*# mmcli -m 0
--command='AT+QNVFR="/nv/item_files/modem/mmode/ue_usage_setting"'*response:
'+QNVFR: 01'

This shows up as `csps-2` in MM status.


*# mmcli -m 0 | grep "ue mode"*  3GPP EPS |   ue mode of operation: csps-2

If I change the `ue_usage_setting` to `00`, MM status is `csps-1` (though I
have to reset/power-cycle the modem, otherwise MM status still reports
`csps-2`).


*# mmcli -m 0
--command='AT+QNVFW="/nv/item_files/modem/mmode/ue_usage_setting",00'*response:
''

*# mmcli -m 0
--command='AT+QNVFR="/nv/item_files/modem/mmode/ue_usage_setting"'*response:
'+QNVFR: 00'


*# mmcli -m 0 | grep "ue mode"*  3GPP EPS |   ue mode of operation: csps-2

After reset/power-cycle modem


*# mmcli -m 1 | grep "ue mode"*  3GPP EPS |   ue mode of operation: csps-1

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