ERROR: Unable to communicate with master!

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안녕하세요!

I'm also not familiar with the turtlebot environment, but working with multiple robots and workstation.

First, when you start the turtlebot process on the turtlebot (aka netbook), do you see the desired topics (do 'rostopic list' on the netbook)? If your network is properly configured, you should see the same list of topics on your workstation (notebook).

Now, based on your comments, the above doesn't work for you. Have you gone through the instructions here: http://www.ros.org/wiki/ROS/NetworkSetup? These instruction are for a general ROS network setup and are more extensive than the ones for the turtlebot. Section "2. Name resolution" might be helpful for you. Try setting the ROS_IP in addition to ROS_MASTER_URI. That often helps me when I have problems with the 2-way communication robot <-> workstation.

PS: I seldom use ROS_HOSTNAME. This requires that your machine can resolve that name, e.g. you need DNS server working or the required entries set in /etc/hosts (assuming your are running linux).

Hi, My answer here might help you check your network setup. http://answers.ros.org/question/29983/turtlebot_teleop-not-working-properly

Hope it helps, Karthik