Learning how to talk to Bluetooth devices (headphones, TVs, fitness monitors, ...) is not only a useful skill, it’s also massive fun! Recent releases of Android have improved how Bluetooth Low Energy (BLE) interaction works, and this session takes you from first principles right through to the latest changes in Android 15. Learn: - All about BLE: how it works and what makes it different to Bluetooth Classic. - How Android communicates with a BLE device - How to write Kotlin code to send and receive messages from an Android device to any BLE peripheral This workshop is built around a capture-the-flag competition: the first person to write an app to read my password, wins!