Hey > > When trying to set the allowed modes (4G only in my case), the setting > doesn't seem to persist across power-cycles of the modem. Is there a way > to make this setting permanent or reset it every time the modem state > machine is brought up by ModemManager (perhaps a simple external script, > but when to run it?)? My modem is a Quectel EG91-E and ModemManager is > using the QMI interface. >
There was a recent issue about this as well: https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/580 There's a TLV in the "NAS Set System Selection Preference" named "Change Duration" (0x17), which we set to QMI_NAS_CHANGE_DURATION_PERMANENT (the other value supported is QMI_NAS_CHANGE_DURATION_POWER_CYCLE). Unless we're doing something wrong, I think this is the way to ask for a permanent change, so not sure what else we could be doing. -- Aleksander https://aleksander.es
