How to make --nas-set-system-selection-preference='umts|lte' persistent ?

[Gopakumar Choorakkot Edakkunni]

So just to update on this thread for benifit of anyone else who does a
google search :). Eventually I ended up doing
--nas-set-system-selection-preference='umts|lte' AND unbinding + binding
qmi_wwan driver. After that looks like a
--nas-get-system-selection-preference says 'umts lte' as expected.
Nevertheless, the setting doesnt persist - maybe its something to do with
the ac340u in specific.

Rgds,
Gopa.


On Fri, Nov 7, 2014 at 12:03 AM, Gopakumar Choorakkot Edakkunni <
gopakumar.c.e at gmail.com> wrote:

> Thanks for the responses. For some reason my AC340U doesnt save these
> settings, after plugging out + putting back in its back to square on. Will
> try experimenting more things.
>
>
> Rgds,
> Gopa.
>
>
> On Tue, Nov 4, 2014 at 2:13 AM, Aleksander Morgado <
> aleksander at aleksander.es> wrote:
>
>> Hey,
>>
>> On Tue, Nov 4, 2014 at 6:55 AM, Gopakumar Choorakkot Edakkunni
>> <gopakumar.c.e at gmail.com> wrote:
>> > So I wanted to disable my modem from trying to connect to 2G because I
>> saw
>> > some threads that says that Sierra modem firmware conks at times when
>> they
>> > try to connect to 2G. I have a Sierra AC314U modem.
>> >
>> > So I said qmicli -d /dev/cdc-wdm0
>> > --nas-set-system-selection-preference='umts|lte' - basically saying
>> that use
>> > only 3G and LTE. After that point the modem goes back to "Ready to
>> connect"
>> > state.
>> >
>> > Now I try using - qmicli -d /dev/cdc-wdm0 --wds-start-network=broadband
>> > --client-no-release-cid to initiate the connection (which is what I
>> usually
>> > use to connect and it works). But after that point the modem refuses to
>> > connect even though the --nas-get-system-info option shows available
>> 3G/LTE
>> > networks.
>> >
>> >
>> > So I suspected that its because the nas-set-system-selection-preference
>> says
>> > that a modem reset is needed, and I did not reset the modem. So I
>> forced a
>> > reset using the below pair of commands, but after the  reset the
>> umts|lte
>> > selection I made is thrown out and its back to gsm|umts
>> > lte. So thats a chicken and egg problem.
>> >
>> >
>> > qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode=offline
>> > qmicli -d /dev/cdc-wdm0 --dms-set-operating-mode=reset
>> >
>> > So my question is: If the
>> "--nas-set-system-selection-preference='umts|lte'"
>> > needs a reset and the setting is wiped out after a reset, how exactly
>> do I
>> > do that ? Any guidance will be appreciated!
>>
>> qmicli --nas-set-system-selection-preference uses
>> QMI_NAS_CHANGE_DURATION_PERMANENT when setting the new selection
>> preference; which means that the modem is instructed to store it so
>> that the setting is kept after all reboots.
>>
>> The offline->reset sequence, for what we know, is only required when
>> you're e.g. switching from CDMA/EVDO-mode to GSM/UMTS/LTE-mode (in
>> modems supporting all). That's what we do in ModemManager at least.
>>
>> For 2G/3G connections there's also the "WCDMA acquisition order
>> preference" configuration which is also used in the Set System
>> Selection preference command, *but* qmicli doesn't use it. That
>> preference allows to say e.g. "3G preferred over 2G", but keep both in
>> the allowed list. ModemManager and mmcli allows to play with that one,
>> though.
>>
>>
>> --
>> Aleksander
>> https://aleksander.es
>>
>
>
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