HiBeacons
An iBeacons example app for iOS 10, with Apple Watch (watchOS 3.0)
... beacon operation can only be seen in the phone. (The watch app acts as a simple* remote). The source is easy to understand and modify. The structure of the app is based on a simple hierarchy of operation classes. There are three NATOperation subclasses, each responsible of a specific operation. NATMonitoringOperation, NATAdvertisingOperation, and NATRangingOperation. The app is easy to use with any given proximity UUID and identifier, which can be changed in NATOperation.