Someone have any news about that integration in openHAB? I put this link to show specifications about the webserver named Butler ESW544. As @Giorgio_Graziotti said this web server speaks to fan coil unit via MODBUS. Reading documentation I see they using a beaglebone board to run the web server. I also noticed the same web server software is used by other company with raspberry pi as system board. I don’t have hands on to the innova web server and fan coil units but I am thinking of buying them. If we could understand how the webserver works and first of all if has API available we’ll approach integration to openHAB.