The implementation of applications with wireless networking is becoming commonplace. From consumer devices to industrial applications, there is a growing expectation that devices will have a built-in ability to talk to each other without a hard-wired connection. The MiWi Wireless Networking Protocol is a simple protocol designed for low data rate, short distance, low-cost networks. Fundamentally based on IEEE 802.15.4 for wireless personal area networks (WPANs), the MiWi protocol provides an easy-to-use alternative for wireless communication. In particular, it targets smaller applications that have relatively small network sizes, with few hops between nodes, using Microchip’s MRF24J40 2.4 GHz transceiver for IEEE 802.15.4 compliant networks. This application note covers the definition of the MiWi Wireless Networking Protocol Stack and how it works.