With Bluetooth Low Energy (BLE) smart devices are about to become even smarter This practical guide demonstrates how this exciting wireless technology helps developers build mobile apps that share data with external hardware & how hardware engineers can gain easy & reliable access to mobile operating systems This book provides a solid high-level overview of how devices use BLE to communicate with each other You'll learn useful low-cost tools for developing & testing BLE-enabled mobile apps & embedded firmware & get examples using various development platforms including i OS & Android for app developers & embedded platforms for product designers & hardware engineers Understand how data is organized & transferred by BLE devices Explore BLEs concepts key limitations & network topology Dig into the protocol stack to grasp how & why BLE operates Learn how BLE devices discover each other & establish secure connections Set up the tools & infrastructure for BLE application development Get examples for connecting BLE to iPhones iPads Android devices & sensors Develop code for a simple device that transmits heart rate data to a mobile device