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This paper addresses monitoring and surveillance applications using Wireless Sensors Networks (WSNs). In this context, several remote clients are interested in receiving the information collected by the nodes of a WSN. As WSN devices are most of the time constrained in energy and processing, the authors present a caching architecture that will help reducing unnecessary communications and adapting the network to application needs. Their aim here is to cache information in order to improve the overall network lifetime, while meeting requirements of external applications in terms information freshness. They first describe and evaluate the performance of their caching system using a Constrained Application Protocol (CoAP)-HTTP proxy.
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