@TheoL Thanks for responding and sorry for my late reply.
I finally got an Arduino Nano working as a gateway with RFM69.
It required new/different logic converters as the ones I had apparently were not working correctly.
I can give the RFM69 3.3V power from the Nano, but as the Nano has 5V logic and the RFM69 cannot handle 5V logic as input (NSS, SCK, MOSI) , the logic converters are needed to protect the RFM69 module as also stated in the MySensors radio guide.
I must say that using NRF24 was much easier than using RFM69, but I will stick with RFM69 (433 MHz) for range reasons.
