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In the recent years, wireless sensor networks have attracted a lot of attention due to their broad application areas. In many application scenarios, hundreds or thousands of sensor nodes may be deployed in the physical environment. To design, implement, manage and maintain such large-scale networks efficiently is a major challenge which requires an integrated middleware development approach. In this paper, we focus on the development of a simulation platform specifically designed to support the development of sensor network middleware services. This novel platform is designed in a modular manner to facilitate the rapid integration and testing of different middleware algorithms and services. We present the simulator's software architecture and its operation. A case study to illustrate the usage of our simulation platform is also presented. The simulation platform shows potentials to support the research and development of middleware servicesfor wireless sensor networks.