main()
Turtlebot3Path
Turtlebot3Path.drive_circle()
Turtlebot3PatrolServer
Turtlebot3PatrolServer.cancel_callback()
Turtlebot3PatrolServer.destroy()
Turtlebot3PatrolServer.execute_callback()
Turtlebot3PatrolServer.goal
Turtlebot3PatrolServer.goal_callback()