이 글은 아래의 자료를 참고로 만들어졌습니다. docs.ros.org/en/dashing/Tutorials/Turtlesim/Introducing-Turtlesim.html Introducing turtlesim and rqt — ROS 2 Documentation: Dashing documentation Open a new terminal and source ROS 2 again. At this point you should have three windows open: a terminal running turtlesim_node, a terminal running turtle_teleop_key and the turtlesim window. Arrange these windows so that you ..