=====ROS over the network =====
This page deals with running ROS across [[http://wiki.ros.org/ROS/Tutorials/MultipleMachines|multiple machines ]]. This involves choosing one machine to be the master.

Also see [[http://wiki.ros.org/ROS/NetworkSetup| ROS network setup]]
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====Teleoperation ====
In this scenario, we want to control a mobile robot with a joystick plugged in a a fixed machine. How to do it ? Suppose the master is up and running. How to set up the remote machine :
  * Network issues:
    * Make sure that both machines are on the same network, e.g. ''wifibotlapap''
    * Make sure the master can be reached by its **name**. For example, add the following line in ''/etc/hosts'': <WRAP box 350px>''192.168.1.106 wifibot-lab'' </WRAP>
  * Install the joystick node:  <WRAP box 350px>''sudo apt-get update\\ sudo apt-get install ros-hydro-joy'' </WRAP>
  * Export the master and declare the client IP to ROS: <WRAP box 400px>''export ROS_MASTER_URI=http://wifibot-lab:11311 \\ export ROS_IP=192.168.1.100'' </WRAP>  
  * Run the joystick node: <WRAP box 350px>''rosrun joy joy_node'' </WRAP>
  * You can also run ''rviz'' on the slave, to visualize the robot state <WRAP box 350px>''rosrun rviz rviz'' </WRAP>

In case of trouble, see [[http://wiki.ros.org/ROS/NetworkSetup| ROS network setup]]