https://mirror.umd.edu/roswiki/roscpp(2f)Overview(2f)Callbacks(20)and(20)Spinning.html
roscpp/Overview/Callbacks and Spinning
overviewcallbacksspinning
https://mirror.umd.edu/roswiki/roscpp(2f)Overview(2f)MessagesTraits.html
roscpp/Overview/MessagesTraits
overview
https://mirror.umd.edu/roswiki/roscpp_serialization.html?distro=indigo
roscpp_serialization
serialization