[$] Zephyr: a modular OS for resource-constrained devices

Writing applications for devices with a lot of resource constraints,such as a small amount of RAM or no memory-management unit (MMU), poses somechallenges. Running a Linux distribution often isn't an option on these devices,but there are operating systems that try to bridge the gap between runninga Linux distribution and using bare-metal development. One of these is Zephyr, a real-time operating system(RTOS) launched by the Linux Foundation in2016. LWN looked in on Zephyr at its four-yearanniversary as well. Seven years after its announcement, Zephyr has made lots of progress and now has an active ecosystem surrounding it.