In search for a good solution for my Milights I found this neat project:
https://github.com/sidoh/esp8266_milight_hub
Just installed it because I had the parts lying around and it works like a charm. You can make a lot of virtual gateways and add them all to Domoticz so no more 4 zone limit. You even can spoof a gateway if you already have one. By far the cheapest solution with lots of possibilities:
- no zone limit
- rest api
- MQTT integration
- UDP gateway

Greetings,