@flyyboyy A1: From the datasheet: 3.3V operation with 5V I/O signal tolerance A2: I think so A3: If I understand the library code correctly, the new RFM69 driver supports softspi but the old does not. Add this to your sketch (before #include MySensors.h) for both the gateway sketch and the node sketch. #define MY_RFM69_NEW_DRIVER A4: If you don't know you need it, leave it the way it is in the example. This goes for almost everything. A5: Do you mean MY_CONTROLLER_IP_ADDRESS? This is only used for client mode. I think OpenHab can use server mode. A6: Just leave the default A7: When you want to use local sensors, you'll hopefully know why :) There is absolutely no need for local sensors, but MySensors supports local sensors for those who want them. A8: Correct.