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Porting our products to Zephyr and a common microprocessor presented the opportunity to move to a higher proportion of common reusable code across devices. We present for community use and comment our architectural approach to developing a reusable Zephyr application code base.
We have leveraged zbus to create a standardised interface for inter thread communication, and a layer of zbus listeners (what we call a link layer) to enable our communication, UI, and system control to be reusable across products.
The approach is somewhat analogous to micro-services, in that our applications now each consist of ~5 independent services/modules. Each service delivers a specific independent function, and uses zbus to interface with the rest of the system in a common manner. But this is as far as the analogy goes. The choices were driven by a strong desire for maintaining a separation of concerns and modularity. So far it has proven itself to enhance testability, debugging, and to support significant code reuse and therefore maintainability of multiple code bases.
