RE: How to achieve NB-IoT/LTE-M fallback in NRF9160 ?

Håkon Alseth — Tue, 23 Nov 2021 08:47:23 GMT

Hi,

The "lte_lc" module has a option for a fallback, but this is only on the initial connect to the network.

In order to change the network mode dynamically, this should be implemented in your application.

You could do something like this:

1. check the network state for x amount of time (For instance AT+CEREG?)

you can change to flight mode (AT+CFUN=4)

3. Change the systemmode (AT%XSYSTEMMODE) to your preferred mode

4. go back to online mode (AT+CFUN=1) and see if it connects on the newly selected network mode

Note: you can use modem_info to get some of the above mentioned notifications (from AT+CEREG) if wanted.

Kind regards,

Håkon