The best laid plans to scale product manufacturing failed due to a shortage of key components, mainly microcontrollers. Using Zephyr's abstraction layers and device-independent protocol stacks, it became possible to redesign products to work around the shortage, while not having to rewrite the applications.  

This talk touches on hardware design tricks, devicetree, and software best practices to make sure you can still build your IoT device when the chips go out of stock again.