In this paper we consider the problem of sharing data collected by sensors worldwide amongst different applications. We focus on the increasingly large collection of powerful sensor nodes which have full-time connections to the Internet, and describe a distributed architecture capable of flexibly sharing these data streams. The solution must operate reliably and continuously despite live configuration changes and failures. We draw on event-based systems and present the component middleware we

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... ve implemented for processing and distributing sensor data. A key aspect is its support for third-party remapping between components in order to adapt to topology changes. We also show that it is able to rapidly reconfigure itself when failures occur.