I needed a solution for large 2 pipe steam boiler system zoned by room. It is controlled by a Wago 750-841 modbus ip unit. Firing RIB relays to turn on the boiler and put the T-Stats into day or night mode. My Scheduling is done with google calendars. I wrote a java app the connect via google's API. Need to integrate with mango let me know if it is possible. Also control a Mitsubishi City Line system via BACnet at the same time. Awesome! Would have not been possible without this app. I will post pics and other cool stuff once I am done.