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Existing publish/subscribe architectures for wireless sensors networks only support stationary sensors interconnected with each other. They cannot handle mobile sensors or remote sensors that are sparsely deployed. In this paper, the authors propose a novel ubiquitous publish/subscribe system that supports data access from both mobile sensors and stationary sensors. Their system utilizes mobile phones as data mules to relay subscriptions and published data between broker and remote sensors. It provides content-based publish/subscribe services from sensors deployed anywhere without depending on any network infrastructure. They implement their publish/subscribe platform on real hardwares and test it in a hiking trail application.
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