Topics created by perIpI

@electrik Tested and worked as well. I think this is preferable over the first solution (forward function declaration) as it gives a reference where the functions are defined. Thank you!

I also edited according to @Yveaux 's workaround and it works! I found however that in order to get the MQTT GW to listen to messages and forward them to the broker, I had to set wait(2000); in the void loop() If I set wait(0) the GW started but did not listen to messages. If I set wait(100); the GW started spamming the broker with the presentation message. Again, a big thank you to everybody involved. "Now we are cooking with gas again!"

Replying myself after more reading and testing. *MQTT vs ETH probably is equivalent in my system, if the choice if given I think MQTT is preferred. *NRF24 or RFM69, maybe both as I already have a bunch of NRF24 radios home and can start build directly. *PC based MQTT could be an idea, but probably its as easy to work through an Arduino-example using the serial monitor in an Arduino-environment. My way forward will be: Remove the RPi-GPIO-gateway (I built a basic node and tested it, but could not communicate with the GW) and replace it with ESP8266-based WIFI/MQTT/Radio-gateway (one with NRF24 and eventually one with RFM69). I believe that will be an easier way into mySensors-world also limiting the amount of required Linux-related knowledge. It will be easier to debug the system from Arduino IDE-serial console. Ie start and confirm OH3 to MySensors-MQTT-gateway, then proceeding with sensor to gateway communication etc.