This paper presents an experimental deployment of an IP-based wireless sensor network that is intended to operate as an intrusion monitoring system. This network is the first actual deployment of a fully IP-based wireless sensor network with small and computationally constrained sensor nodes. The intrusion monitoring system detects motion in a building which should be empty. The detected events are transmitted to an external monitoring entity, as well as logged inside the network. The logged events are distributed throughout the network and can be collected with a PDA inside the monitored building. The paper has also learned that the software development process is very time consuming unless support for over-the-air reprogramming is implemented, and that the unpredictability of radio conditions make sensor node placement hard.
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