Self-Configurable Publish/Subscribe Middleware for Wireless Sensor Networks

In the publish/subscribe (pub/sub) communication scheme in wireless sensor networks (WSNs), there exist inherent tradeoffs among conflicting objectives in event publication. To address this issue, this paper investigates pub/sub middleware for WSNs, called TinyDDS. With its selfconfiguring event routing protocol, TinyDDS adaptively performs event publication according to dynamic network conditions and autonomously balances its performance among conflicting objectives. TinyDDS leverages an evolutionary multiobjective optimization mechanism to seek the optimal tradeoffs among objectives and adjust parameters in its event routing protocol. Simulation results validate the ability of TinyDDS to tune its event publication against dynamic network conditions. TinyDDS is implemented lightweight and efficient enough to run on resourcelimited nodes.