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
