BytePack is a header-only C++17 library that solves a classic embedded-systems problem: keeping your data serialization in sync with your struct definitions. According to Adafruit, you write each struct's fields once, in a single io() function, and that definition drives serialization, deserialization, and compile-time sizing all at once. One source of truth means the bug where serialization code drifts out of sync with your struct definition simply can't happen. For memory-constrained Arduino and IoT projects, that eliminates a whole category of subtle, hard-to-debug errors. Being header-only means zero runtime overhead.

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