I bought an NbIoT Shield for Raspberry PI3 B+. I have been able to send AT commands and send a UDP message. But my problem is how I can run now my Java LwM2M client? When my raspberry is connected to WiFi it works, I was expecting after getting a connection with SixFab NbIoT shield I would be able to run my client using UDP (Coap). Is there any driver kind of S/W that I can use NbIoT Shield as a network card?
You can set the raspberry pi up to setup the PPP connection when it boots. I did this exact thing. You may have to work out on the client some sort of management to test for a valid connection. Other than that this will work.