Open Source Summit Europe 2022

Anybody eager to learn about IoT devices has at least once tried to play with Zigbee or 6lowpan sensors. These two protocols are built on top of a well common MAC/PHY specification: IEEE 802.15.4, also known as Wireless Personal Area Networks: WPAN, designed to be low-rate/low-range wireless networks. There is already substantial support for this protocol in the Linux kernel but when my journey started, several of the MAC-related operations well described in the specification were not implemented, making the subsystem mainly useful for very simple use cases: peer-to-peer transmissions. This is unfortunate as a significant part of the idea behind WPAN is to make these networks quite adaptive and resilient, which requires a minimal subset of the peer management procedure to be supported. Besides a number of preparation changes, the main idea behind the continuous flow of patches was to bring support for the scanning procedure which allows a PAN controller to detect all the compatible devices around it in different ways. Discovering these devices is the first step in order to associate them together and build up starred networks. This talk will be an opportunity to explain the new APIs allowing such discoveries and provide a state of the art of the support in the mainline kernel.