Is there any support for Honeywell’s ‘Redlink’ thermostats? These are mesh wireless devices that interface through an ethernet gateway. Their website has a WSDL for programmatic interfacing with it.
There does not appear to be a published way to talk to the local gateway itself via the local ethernet network. And the wireless mesh is a proprietary extension (of Zigbee, iirc). So going through the external website is the sole option at the present.
I have a working setup of this, with several thermostats and wireless sensors.