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A hybrid middleware for RFID-based parking management system is presented in this paper. The publish-subscribe approach is combined with group communication in overlay networks in the design of event monitors and application service connectors to comprise the core of a hybrid middleware. In this paper, group communication relevant to P2P networks is the focus of middleware technology development. A group of peer nodes provide an efficient abstraction to handle events from RFID readers and vehicle identity detectors to be processed by services and applications that run in the conventional IP networks. Programming abstractions for publish-substribe messaging (multicast and single) from the reference P2P systems are used to build new extensions. The hybrid middleware provides an efficient communication transport between the peer-based networks and existing application services and mobile communication infrastructure that require conventional IP-based networks. The simulation results show that the approach improved the performance of the P2P network. This paper provides an implementation model that can significantly lower the infrastructure cost for building an electronic parking management system.