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This is a question I would consider as important as well, and something for which I have yet to find a proper solution.

There is a related question here on ROS Answers already From structure to message, however it still requires the availability of ROS message types.

Overall the approach requires the manual creation of multiple (several) message types for nested structs as well as the definition of things like hash functions (ros::message_traints::MD5Sum< MyType >::value()) for the custom type.