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The heartbeat of the firmware might be used for multiple purposes. It
can trigger a blinking LED on the PCB, can be displayed in a client
program or might serve additional purposes.
Since at least display in client programs should be implemented and
multiple clients should be support in long term it improves the code
structure to use a zbus channel here to publish heartbeat messages in a
publish-subscribe pattern.
That way the publishing of the heartbeat message and the receiving by an
unknown number of observers is completely decoupled. A central trait of
the publish-subscribe pattern and an advantage for a modular code
structure.
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