This book presents a detailed network protocol description of ZigBee and demonstrates how to develop ZigBee-based customized applications. After a brief introduction to near-field communications and related protocols, the text discusses ZigBee architecture, standards, and protocols and addresses potential issues from power management, security, reliability, quality of service, topology control, routing, and transport protocols. The text also covers a wide range of ZigBee applications in diverse fields, with an emphasis on tools for development based on commercially available kits. The authors conclude by comparing ZigBee with other relevant protocols, including Wireless Hart and RFID.