I created 2 addons to integrate the German automation hub Smart Friends into Home Assistant. There is a simple REST gateway which can be polled for information and there is also an MQTT variant which once you have mapped the Smart Friends device ID to a hassio device type, they will be available in the MQTT integration.
My addon repository is at https://github.com/GimpArm/hassio-addons
The Smart Friends hub has support for a number of proprietary devices like the Schellenberg line of automated shades (Rollladen). It also has Z-Waze and Zigbee support. Although I’ve found that anything beyond a simple switch or sensor isn’t supported.
With my addons the devices integrated seamlessly and easily into the hassio environment.