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We propose a software-defined wireless sensor network system whose behavior can be redefined even after deployment by the injection of sensor node roles by means of wireless network communications. Two main technologies are used to develop this system, role generation and delivery mechanism, and a reconfigurable wireless sensor network with many reconfigurable sensor nodes. In the role generation and delivery mechanism, a scenario compiler generates roles for sensor nodes based on a user-defined scenario description and then delivers the roles to appropriate nodes. We also propose a reconfigurable sensor node composed of an ultra-low power field programmable gate array (FPGA) and a microcontroller unit (MCU) for altering network behavior. By assigning heavy tasks such as sensor and data processing to the FPGA, overloading of the MCU can be avoided. Using wireless communication …