Too bad that a lot of the commercially available gear is either expensive, short-living or insecure. As a developer, why not just "wire up" what you already have and make your home smarter that way? At WWDC 17, Apple announced to open up HomeKit access to non-commercial individual developers and is now providing the documentation for the HomeKit Accessory Protocol (HAP) to the public. This hands-on introduction gives some ideas what’s possible and how to get started.