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

[Gopakumar Choorakkot Edakkunni]

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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