You can add an arbitrary number of UDP gateways through the REST API or through the web UI. Each gateway server listens on a port and responds to the standard set of commands supported by the Milight protocol. This should allow you to use one of these with standard Milight integrations (SmartThings, Home Assistant, OpenHAB, etc.).
You can select between versions 5 and 6 of the UDP protocol (documented [here](http://www.limitlessled.com/dev/)). Version 6 has support for the newer RGB+CCT bulbs and also includes response packets, which can theoretically improve reliability. Version 5 has much smaller packets and is probably lower latency.
Chris Mullins