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Wireless sensor networks research is primarily focused on various internal sensor network issues like routing, self-organization, MAC layer design, data aggregation, etc. Interaction between sensor networks and especially such interaction over mobile networks has not been researched well. In this paper, concept of mobile peer-topeer sensor networks, i.e. peer-to-peer sensor networks overlay on 3G mobile networks is presented. Each sensor network acts as one peer node and is represented by its gateway in a P2P network. Peers use mobile networks to communicate and collaborate on execution of specific tasks or to provide information to users that otherwise would not be available. Usability of JXTA as P2P framework in mobile environment has been investigated. Architecture of a sensor network gateway is also presented.

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Mesh networks conveniently complement infrastructurebased networks, allowing devices to spontaneously form a network and connect with other networks. However, effective service provisioning requires a network monitoring solution with adequate support for topology data dissemination and diagnosis, due to the underlying network dynamics and the absence of pre-existing network infrastructure. In addition, monitoring systems have to face a number of challenges relating to autonomy, robustness and scalability. To this end, we have created a self-organised management overlay that homogeneously and dynamically organises devices into a cluster-based hierarchy on which monitored data is disseminated. Scalability of the monitoring system is achieved through the minimisation of the generated traffic, as a result of the optimised design. We have implemented the proposed monitoring system and evaluated through experiments the resulting performance.