echo "See https://qiita.com/porizou1/items/152ad3829e84a9ba0355 "
ros2 launch turtlebot3_gazebo turtlebot3_world.launch.py &
read -n 1 -p "Please hit any key to start slam toolbox" aaa
ros2 launch slam_toolbox online_async_launch.py use_sim_time:=True &
rviz2 &