Design review: RTOS

[krook]

Switch from Arduino super loop to an RTOS like Zephyr, which is also a Linux Foundation project.

The current version of the firmware does not support an RTOS. This is a critical piece of scalable firmware development and should generally be the preferred architecture as opposed to super-loop-style programming.

The Arduino IDE does appear to have unofficial support of FreeRTOS, but a better recommendation that is more in line with the spirit of this project, and also solves all toolchain issues is Zephyr RTOS.

Zephyr is a fully open source RTOS which is best described as Linux for microcontrollers. It is backed by the Linux Foundation, it utilizes a significant number of design philosophies created for Linux kernel programming, and it is designed to easily bridge vendor-provided HALs directly to the Zephyr Kernel through flexible API layers. Zephyr is also in the process of making official a functional safety certification.