Applications I -- K2: A System for Campaign Deployments of Wireless Sensor Networks -- TigerCENSE: Wireless Image Sensor Network to Monitor Tiger Movement -- Motes in the Jungle: Lessons Learned from a Short-Term WSN Deployment in the Ecuador Cloud Forest -- Deploying Wireless Sensor Networking Technology in a Rescue Team Context -- OS Support and Programming -- Visibility Levels: Managing the Tradeoff between Visibility and Resource Consumption -- Flexible Online Energy Accounting in TinyOS -- TikiriDev: A UNIX-Like Device Abstraction for Contiki -- Applications II -- Location Based Wireless Sensor Services in Life Science Automation -- Hallway Monitoring: Distributed Data Processing with Wireless Sensor Networks -- senSebuddy: A Buddy to Your Wireless Sensor Network -- Communication and MAC -- Evaluation of an Electronically Switched Directional Antenna for Real-World Low-Power Wireless Networks -- Implementation and Evaluation of Combined Positioning and Communication -- SPIDA: A Direction-Finding Antenna for Wireless Sensor Networks -- Testing Selective Transmission with Low Power Listening -- An Experimental Study on IEEE 802.15.4 Multichannel Transmission to Improve RSSI–Based Service Performance -- Poster and Demonstration Abstracts -- Multicasting Enabled Routing Protocol Optimized for Wireless Sensor Networks -- GINSENG - Performance Control in Wireless Sensor Networks -- LynxNet: Wild Animal Monitoring Using Sensor Networks -- Demo Abstract: Bridging the Gap between Simulated Sensor Nodes and the Real World -- A Mote-in-the-Loop Approach for Exploring Communication Strategies for Sensor Networks -- The Deployment of TikiriDB for Monitoring Palm Sap Production -- Cooperative Virtual Memory for Sensor Nodes -- GinConf: A Configuration and Execution Interface for Wireless Sensor Network in Industrial Context -- EdiMote: A Flexible Sensor Node Prototyping and Profiling Tool -- Virtual Sensor WPAN on Demand -- TikiriAC: Node-Level Equally Distributed Access Control for Shared Sensor Networks.

This book constitutes the refereed proceedings of the 4th International Workshop on Real-World Wireless Sensor Networks, REALWSN 2010, held in Colombo, Sri Lanka, in December 2010. The 11 full papers and the 5 short papers presented were carefully reviewed and selected from 34 submissions. The papers are organized in topical sections on applications; OS support and programming; communication & MAC; and poster and demonstration abstracts.