=====DEBUG ROS OVER NETWORK =====
====Joystick teleoperation ====
  * Use case: ''roscore'' runs on some robot R. Joystick is on some remote client C
  * Make sure you've exported the master, and the IP of C.
  * On C: ''rosrun joy_node joy'', then ''rostopic echo joy''. When you move the joystick, you should see some output.
  * On R: ''rostopic echo joy''. When you move the joystick, you should see some output. If not, then maybe the IP of the client C is not known to the master.