This video explains a simple BLE Explorer written in Xamarin (using ). In essence the app is a simple version of the nRF app: It allows the user to select a BLE device, then shows all available services. Upon selection of a service it will show the available Characteristics. One can then read/write strings or register to Characteristics with "notify" enabled. Code is available here: Code was originally based on Jenx Bluetooth example, but then updated and changed to be compatible with modern Android phones (release 12 and higher): Code is written for Android Release 12 or newer. All logic is placed in Code Behind in this example. repository (with information on adaption for Iphones): Chapters 0:00 Introduction 3:14 Installation of programming environment 6:19 Enable USB Debugging on your phone 8:00 Download code from Github 8:44 Enabling Bluetooth on Android 12 or newer 11:11 App description: 11:42 App description: Bluetooth Devices Page 18:45 App description: Bluetooth Services Page 25:38 App description: Bluetooth Characteristics Page 31:22 Notify callback function 36:50 Send and Receive functions