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There is a recent increase of interests in Wireless Sensor Networks (WSNs), both from commercial and technical point of view, due to their simplicity, low cost and easy deployment. Those networks can serve for different purposes, from measurement and detection, to automation and process control. A typical WSN consists of a large number of battery-operated Sensors and Actuators (SAs), which are usually equipped with a limited amount of storage and processing capabilities. It is important that those devices communicate wirelessly, since the number of SA-nodes is typically very large, and the cost of deployment of a wired infrastructure is prohibitively expensive.
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