Book excerpt: This book is a practical guide to programming Bluetooth Low Energy for nRFx Bluetooth-enabled programmable microcontrollers. In this book, you will learn the basics of how to program an nRF microcontroller to communicate with any Central device over Bluetooth Low Energy. Each chapter of the book builds on the previous one, culminating in three projects: - An iBeacon - An Echo Server - A Remote Controlled Device Through the course of the book you will learn important concepts that relate to: - How Bluetooth Low Energy works - How data is sent and received - Common paradigms for handling data Skill Level This book is excellent for anyone who has basic or advanced knowledge of nRFx, microcontroller programming, or C++.