The Zephyr Project is a scalable real-time operating system (RTOS) supporting multiple hardware architectures with more than 82 development boards supported already, with additional hardware support being added regularly, optimized for resource constrained devices, and built with security in mind. The Zephyr Project wants to be the open source "Linux of Embedded". Zephyr Project members include Linaro and the Open Source Foundries, Intel, NXP, Synopsys, Nordic Semiconductor, DeviceTone, runtime.io, Texas Instruments, Oticon and more. This video features functional prototype devices using the Zephyr kernel, including a functional Bluetooth Mesh network, a low energy Bluetooth controller, and an OpenThread demo. Other demos include the World’s first Bluetooth 5.0 qualified, open source low energy Bluetooth Controller that features open source code from Application to Radio, a BlueZ Bluetooth Host stack, a Zephyr kernel, low energy link layer, OS Host Controller Interface, the Nordic Semiconductor nRF52, and the Arm Cortex M4F + Bluetooth 5 and Radio SoC. This demo will take a closer look at the different layers that make up a full BLE protocol stack helps explain this capability. Bluetooth Mesh in action on BBC micro:bit boards available since Zephyr OS v1.9 showcases the many-to-many BLE communication, how every node can be a relay and the user interface. A functional Bluetooth Mesh Network with Lightweight Machine to Machine Device Management showcases the Cloud Device Management System using Linux-based IoT gateways and Zephyr-based IoT devices for real-world project prototypes and smart objects. A demonstration of OpenThread integration, benefits from the Zephyr infrastructure and how it works with Nordic nRF52840 and OpenThread 6loWPAN Thread Stack. The flow of IP traffic is handled seamlessly by both the Zephyr native IP stack and OpenThread: 802.15.4 traffic received by radio driver is forwarded to the OpenThread stack, where it is processed by the 802.15.4 MAC, 6loWPAN and IPv6 layers implemented in OpenThread.