You could build one in the form of Raspberry with all the radios now a lot cheaper (hardware and then the hunt for software in open source) but consider your time and the research in doing this. But we are now getting to the era of universal mainstream hubs. There a few startups in the pipeline. Waiting for a new one (ordered hub) at moment. Will post on this when have in my possession. But I am very happy with ALL Xiaomi hardware/progress and Yeelights - now and into the future. Third party hardware automation will also become a feature of the Xiaomi Mi Home. Experimental at this stage.