Clustered publish/subscribe in wireless actuator and sensor networks

In this paper, we present a new method to realize a selforganizing and self-stabilizing publish/subscribe middleware for wireless actuator and sensor networks. By using simple, yet powerful compositional rules, our approach forms hierarchical clusters of nodes and sets up many small publish/subscribe networks, that interact with each other. Thereby, we are able to integrate the necessary routing of messages between clusters into the publish/subscribe substrate itself. This technique reveals several benefits, such as redundant routes and automatic route recovery, which show up as emergent behavior at no additional cost. The provided publish/subscribe middleware allows an elegant design of eventbased applications for pervasive environments.