実際のところ
ros2 launch ros2_control_demo_example_9 rrbot_gazebo_classic.launch.py gui:=true
ros2 topic pub /forward_position_controller/commands std_msgs/msg/Float64MultiArray "data: - 0.5 - 0.5"
ros2 topic echo /joint_states
ros2 topic echo /dynamic_joint_states
