PDP settings for LTE only network

[Aleksander Morgado]

Hey!

> > >
> > > Is there an equivalent setting in the NetworkManager system connection configuration file for -- 3gpp-set-initial-eps-bearer-settings='apn=something' ?
> > >
> >
> > No, there is no such thing. There's a bit of a grey line between what
> > NM should or should not do in this regard. The Initial EPS bearer
> > settings are part of the settings required during registration, even
> > before the modem gets connected, so NM doesn't really do anything in
> > that regard, it doesn't take care of "configuring disconnected
> > modems". If anything, a systems-level settings application should take
> > care of that configuration, e.g. the GNOME Settings app in a standard
> > Linux desktop.
> >
> > > Is there a similar command or NM setting to set the modem UE Usage Setting to data-centric mode?
> > > Equivalent to: AT+QNVFW="/nv/item_files/modem/mmode/ue_usage_setting",01
> > >
> > > That command came from a Quectel document for AT&T 3G Sunset Guide.
> > >
> >
> > mmcli has --3gpp-set-eps-ue-mode-operation=ps2 for that, but it will
> > only work if the modem supports +CEMODE; not all modems I've found
> > support it. And even so, I'm not sure if the CEMODE command would be
> > fully equivalent to that change in the settings with QNVFW, maybe ask
> > Quectel about that?
>
> Hi Aleksander,
>
> on all Qualcomm firmwares I have seen so far AT+CEMODE only supports
> reading the setting but not changing it.

Could be the case; when I implemented it I was using an Intel-based
TOBY-L4, which did support both reading and setting.

> The TS 27.007 command
> corresponding to the above AT+QNVFW command seems to be AT+CEUS
> which typically isn't implemented at all.
>
> However NASSetSystemSelectionPref TLV 0x21 which is already part
> of the original Gobi API usually seems to work quite well.
>

Oh, thanks for the hint!

So that would be
qmi_message_nas_set_system_selection_preference_input_set_usage_preference()
with QMI_NAS_USAGE_PREFERENCE_DATA_CENTRIC.

https://gitlab.freedesktop.org/mobile-broadband/libqmi/-/blob/main/data/qmi-service-nas.json#L1530

I think we could update ModemManager to support that.

Looks like AT+CEUS and the QMI variant are a subset of what AT+CEMODE
allows, right? Or am I missing something?

-- 
Aleksander
https://aleksander.es