WMOS: A Wireless Message-Oriented System for Wireless Sensor Networks

The information dissemination in Wireless Sensor Networks (WSN) is an important but complex and challenging problem. Designing suitable communication primitives for these systems is critical. One of these primitives is the publish/subscribe paradigm. The data-management task in Wireless Sensor Networks (WSN) should be performed such than limited resources like memory, processing and power are utilized very efficiently. A message-oriented middleware system based on pub/sub paradigm has been proposed in order to both facilitating the development of these applications and providing common application services. This paper explores a middleware for WSN named WMOS (Wireless Message-Oriented System) which is developed based on TinyOS. WMOS proposed in this paper for managing the request for data and events from sensor nodes and responses that are provided to the users who set the request in P2P-WSN is Publisher/Subscribe based. The three main features of our middleware are the following: First, WMOS is well-adapted to scalable systems without compromising any subscription criteria or network reorganization,our solution is fully distributed and modular, thus making it appropriate for practical implementations. Second, we supply self-adapt multilevel QoS service in order to save limited resources efficiently. Third, By WSN application, we propose topic/content double mode based on XML matched, query information very efficiently than other middleware systems.