@boylucky Thank you a lot, you described the changes nicely. Only one question -> you use atmega328_1a_4MHz.hex file. Where does this file came from? Did you just copy and rename one of the .hex files? What need to be change in this hex file or how to make one?

GW to node communication is not affected by Serial / MQTT / Ethernet interface with controller. With ethernet and MQTT you could actually connect more controllers to the same gateway, even on different computers. You can also have gateway running as a service on the RPI with radio directly on the GPIO and you can connect to is from wherever you have IP communication to the RPI (if you use the ethernet) or the MQTT broker (that could also be on another network)

@boylucky I don't foresee any difficulties doing that, except maybe efficiently powering a gateway from batteries. If you can do solar in the garden, then maybe that's your answer.

@wikibear - no problem :slightly_smiling_face: