Copy the nefit directory + its content to your ../domoticz/plugin directory
You can now select ""Nefit EMS-ESP with Proddy firmware" as new hardware in Domoticz
Don't forget to tick "accept new hardware devices" or click "allow for 5 minutes" in Settings first
Enter your MQTT server address and click "add"

The plugin will create 3 new devices:
- room temperature (as measured in the thermostat) under "temperature"
- system pressure under "utility"
- a device to set the thermostat (change temperature setting) under "utility"