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I just confirmed through experimentation that adding an = sign after any variable name in a ROS *.msg message definition file appears to be how to set constants, and all variables with an = after them show up in the autogenerated C++ *.h files as static constexpr constants.

I just confirmed through experimentation that adding an = sign after any variable name in a ROS *.msg message definition file appears to be how to set constants, and all variables with an = after them show up in the autogenerated C++ *.h files as public static constexpr ~~constants.~~constants inside the autogenerated class (struct actually).

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