Short-range wireless networks (SRWN) are an increasingly popular discipline, as they allow an enormous number of new applications for ubiquitous computing by the use of low-cost, low-power, but flexible and mobile wireless nodes.ZigBee promises to be the major standard for short-range wireless networks. It is endorsed by the ZigBee Alliance, a consortium with currently more than 300 official member companies, including six of the world's top ten semiconductor manufacturers, both as Alliance members and producers of ZigBee silicon.Today, system designers can choose from a large variety of products offered by ZigBee member companies, which are already available in good quality, with attractive pricing, and mix and match their solutions. The ZigBee Alliance maintains a stringent platform certification testing program which ensures interoberability, compliance, and conformance of ZigBee compliant platform to the standard (http://www.zigbee.org).However, they will soon find out that the generic approach of IEEE802.15.4 and ZigBee allows not only a good adaptability to the target, but also an extremely large design space with a big amount of design variables.The ZigBee Developers