Wearable devices are getting more advanced all the time. In the future, you will be able to control your smart gadgets using your mind. That future is not too far out. Take the Touch wearable for instance. It is a smart device that reads brainwaves from 8 regions of your brain and translates them into commands, allowing you to control drones and other smart gadgets.
Touch is compatible with iOS and Android devices. It provides you with real-time feedback. The developers are planning to release and open SDK for the device. More information is available on Indiegogo.