[ros-users] Strange problem running ROS across multiple machines

Ander Ansuategui aansuategui at tekniker.es
Thu Sep 8 08:57:30 UTC 2011

we are facing some strange problems regarding communication between multiple  machines. We are developing a teleoperation package for our Segway RMP200 robot, which has a Kinect on top. We run roscore, openni and the segway driver on the robot, and we can see all the topics by using rostopic list  command from a laptop. Moreover, we receive the kinect image successfully in our teleoperation application running in the laptop, and we also have a ros service running on the robot, which is called also successfully.
The problem comes when we try to move the robot by sending Twist messages to /cmd_vel topic. Apparently the messages don't reach the robot because when we run "rostopic echo /cmd_vel" command no data is shown. But when running the same command in the laptop, the data is shown as expected.
Following the tutorials, we have just changed the  laptop's ROS_MASTER_URI var. We have tried ad-hoc wired and wireless communication. We are surprised because most of the communication works (kinect and service call for instance) but writing to topics doesn't. Has anyone experienced a similar behavior?
We would be very grateful for any help.

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