Explore a declarative approach to message handling in embedded systems using modern C++ techniques in this conference talk from CppNow 2022. Dive into common challenges of embedded systems, including asynchronous message parsing, bit mapping fields, filtering, and dispatching to handlers. Learn how to build a flexible C++17 library for efficient message handling, applicable to both deeply embedded devices and bit-field aggregated message formats. Examine basic idioms, language gotchas, and performance considerations while developing a solution sensitive to small footprint embedded targets. Gain insights into declarative programming techniques useful for library development and embedded systems design.