Hi, got it all working now with several devices. Next step i’m considering is to create a 433Mhz version on a board without WiFi. This saves energy a collegue (not using Homey) told me. Any experience with this? Is MQTT still supported than? Different topic maybe?
You’d need a 433Mhz receiver that would receive the data sent by your device, and that receiver needs to be connected to WiFi (or at least a network) to be able to relay messages to the MQTT broker.
If your device only periodically has to send data (for instance, a temperature/humidity sensor that takes a measurement once every few minutes), you can consider using an ESP8266 that is put into deep sleep mode in between measurements, which will save a lot of power.