When your software has to talk to hardware, the clever protocol is the one you'll regret at 2am.
It's tempting to design a rich, structured message format between your host and your device — length headers, framing, the works. Then something misbehaves on the wire, and now you're decoding your own cleverness with an oscilloscope instead of fixing the actual bug.
If the two sides spoke in something almost insultingly simple — a flat map where one byte means one action — you could watch the entire conversation in a serial monitor and understand it at a glance. Adding a new device becomes: pick the next number. Debugging becomes: read the byte.
That's the choice I made in HomeSense, where the host classifies a spoken command and sends a single-byte opcode down the serial line to an Arduino, which reads it and flips the right pin. Trivial to trace, trivial to extend, and boring in the best possible way.
"Boring and debuggable" beats "elegant and opaque" almost every time a wire is involved. Save your cleverness for the problem that actually needs it.
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