Sensor nodes and complex event processing (CEP) are important and powerful means for gathering data and detecting phenomena of interest in mission-critical pervasive systems, e.g. for emergency and rescue operations. However, the dynamic network does not allow using centralized CEP. To address this issue, we present a component-based distributed CEP middleware. Its main goal is easy reconfigurability to different mobility scenarios. This is achieved by providing an extensible collection of algorithms that are tailored for specific scenarios. The middleware makes it possible to select on demand the algorithms that are most suitable for the current scenario. Our evaluation shows that the middleware works in a broad spectrum of mobility scenarios. We also investigate the trade-off between efficiency and reliability of distributed CEP.
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