Home Kit in iOS

         Home Kit provides seamless integration between accessories that support Apple's Home Automation Protocol and iOS devices, allowing for new advances in home automation. By promoting a common protocol for home automation devices and making a public API available for configuring and communicating with those devices, Home Kit makes possible a marketplace where the app a user controls their home with doesn’t have to be created by the vendor who made their home automation accessories, and where home automation accessories from multiple vendors can all be integrated into a single coherent whole without those vendors having to coordinate directly with each other.


Please find the complete documentation in below link,

https://developer.apple.com/homekit/