Make: Bluetooth LE Projects for Arduino, RasPi, and Smartphones
This book is where your adventures with Bluetooth LE begin! This jam packed book has practical exercises and projects to help you build real BLE devices, an excellent companion book to Getting Started with Bluetooth by Adafruit's own KTown.
You'll start your journey by getting familiar with your hardware options: Arduino, BLE modules, computers (including Raspberry Pi!), and mobile phones. From there, you'll write code and wire circuits to connect off-the-shelf sensors, and even go all the way to writing your own Bluetooth Services. Along the way you'll look at lightbulbs, locks, and Apple's iBeacon technology, as well as get an understanding of Bluetooth security--both how to beat other people's security, and how to make your hardware secure.