The convergence of micro-electronic systems technology, digital electronics and wireless communications made viable the concept of sensor networks. The vision involves a large number of inexpensive nodes which consist of sensing, data processing and short range communicating components. Wireless Sensor Networks (WSN) have the potential to truly revolutionize the way we interact with our environment. Typically, sensors have lower computing power, communication bandwidth and smaller storage compared to traditional wireless devices. The most important characteristic of wireless sensor networks...