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The IEEE 802.15.4/ZigBee protocols are gaining increasing interests in both research and industrial communities as candidate technologies for Wireless Sensor Network (WSN) applications. In this paper, we present an open-source implementation of the IEEE 802.15.4/ZigBee protocol stack under the TinyOS operating system for the MICAz and TelosB motes. This work has been driven by the need for an open- source implementation of the IEEE 802.15.4/ZigBee protocols, filling a gap between some newly released complex C implementations and black-box implementations from different manufacturers. In addition, we share our experience on the challenging problems that we have faced during the implementation of the protocol stack. We strongly believe that this open-source implementation will potentiate research works on the IEEE 802.15.4/ZigBee protocols, allowing their demonstration and validation through experimentation.