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1-3 are the result of an action interface (more information about actionlib).

4 is the result of a tf broadcaster or tf listener.

All of the above are features of ROS that use topics to communicate, but don't require explicitly creating publishers or subscribers, and are not considered part of a node's topic API.

1-3 are the result of an action interface (more information about actionlib).

4 is the result of a tf broadcaster or tf listener.

All of the above are features of ROS that use topics to communicate, but don't require explicitly creating publishers or subscribers, and are not considered part of a node's topic API.