At this time, IEEE 802.15.4 has been developed as the de facto wireless standard for the Internet of Things (IoT), mainly because of its low power consumption and range of up to around 200 meters. The standard is particularly well-suited for the wireless communication of sensors and actuators, for instance in applications for smart homes, smart factories and smart cities. A fully functional implementation for the IoT operating system Contiki is available as an open source code.