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The file you are looking for is automatically generated by the message_generation package, and even if you found the header file (.h), you would be missing the corresponding compiled library implementing the methods defined in the header.

The fact that you are not aware of that suggests you should follow the ROS Tutorials, particularly tutorial 10, which explains how to create and use ROS message and service files. Then, tutorials 14 and 16 further explain the underlying concepts.

I strongly advise you follow the ROS Tutorials (or one of those recently published books about ROS, if you fancy) if you are starting to learn ROS! :-)

The file you are looking for is automatically generated by the message_generation package, and even if you found the header file (.h), you manually adding that to your package would be missing the corresponding compiled library implementing the methods defined in the header.conceptually wrong.

The fact that you are not aware of that suggests you should follow the ROS Tutorials, particularly tutorial 10, which explains how to create and use ROS message and service files. Then, tutorials 14 and 16 further explain the underlying concepts.

I strongly advise you follow the ROS Tutorials (or one of those recently published books about ROS, if you fancy) if you are starting to learn ROS! :-)