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

[Brendan Simon]

Ok, so I might have to talk to Quectel to see what is going on and if there
are alternative options.

I'm thinking that I'll have to bite the bullet and build ModemManager
myself with extra options to accept AT commands, unless I can convince the
Debian maintainers to add the extra option as standard.

BTW, regarding the TS and TLVs that I've seen mentioned - are they publicly
available somewhere?

Thanks,
Brendan.


On Fri, 1 Jul 2022 at 19:36, Aleksander Morgado <aleksander at aleksander.es>
wrote:

> Hey Brendan,
>
> > 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).
> >
>
> The EPS UE mode of operation implementation is currently only
> implemented using AT+CEMODE, so if that's failing to set some of the
> options, it's because the modem is rejecting them in the +CEMODE call.
>
> I've recently discussed about this with @Reinhard Speyerer in some
> emails, and he pointed out there's also now AT+CEUS applicable to both
> 4G and 5G; and he also pointed out that there are some QMI TLVs we
> could use in the "NAS Set System Selection Preference" to configure
> the same settings as +CEMODE and +CEUS. At some point I think we need
> to extend the API with a new method equivalent to +CEUS and still keep
> supporting the +CEMODE based one.
>
> We're in the process of adding a lot of new 5G related APIs, so if
> anyone wants to work on defining new APIs that would fit all this in a
> better way, that would be extremely appreciated.
>
>
> --
> Aleksander
> https://aleksander.es
>
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