@Stefan-de-Lange Power consumption wasn’t the main concern, bigger concern is network limits.
I see now that a node can send up to 120 messages per day. The use case I was looking at sends data every 5 minutes, that’s 288 times a day. So actually it appears we cannot reach the 5 minute interval, at maximum every 12 minutes is possible.
I did some more research into the various protocols, and it looks like the UDP protocol is the most basic one.
The modem setup is actually well described in general at https://docs.iotcreators.com/docs/general-settings
And more specific at https://docs.iotcreators.com/docs/_-2-attach-to-nb-iot-network
I should have looked a little better before asking the question, this depends on the specific modem too I guess.