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How to know if NB-IoT or LTE-M is being used to communicate with base-station (nRF9160)

Hello,

I would like to know if the modem is connected to base station using NB-IoT or LTE-M.

`%XSYSTEMMODE=<M1_support>,<NB1_support>,<GNSS_support>,<LTE_preference>` allows to configure supported features.

I would like to know which technology is being used in the actual communication.

Note:

https://github.com/nrfconnect/sdk-nrf/blob/master/samples/nrf9160/lwm2m_client/src/lwm2m/lwm2m_connmon.c#L22

The LwM2M connman object isn't being populated correctly. Hard coded value irrespective of which type of technology is used.

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