Is it possible to stack an XBee LR radio and a Bluetooth module? It would be nice to use an external data-logger (on a phone) without connecting a cable.
Is there another solution? Maybe adding a Raspberry Pi (I’d prefer to avoid this option).
It’s possible but today not plug-and-play. You need to add the bluetooth by wires: https://www.ardusimple.com/simplertk2b-connection-via-bluetooth/
We are working on a plug-and-play solution for that.