As an example to the IHC SDK for .NET I have made a IHC to MQTT gateway. It is actually some old code I made long time ago to interface to a specific home automation system (I think it was domoticz). I have now made it mode general so you can configure the MQTT topics for each IHC resource.
This is a library for connecting to the IHC controller using .NET. LK (the manufacture for the IHC controller) has not made any sdk or api documentation available. This library has been made by looking at the communication from the ihc applications to the controller. The url’s for the wsdl was found and from these the .net Web References has been made.