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

[Lorenz =?utf-8?Q?M=F6senlechner?=]

Hi,

have a look at the network setup wiki page:
http://www.ros.org/wiki/ROS/NetworkSetup

Lorenz

> Hi Ander,
> 
> Have you checked ROS_IP or ROS_HOSTNAME in addition to ROS_MASTER_URI? I’ve had similar problems when not setting these variables on my teleop computer.
> 
> Take a look here: http://www.ros.org/wiki/ROS/EnvironmentVariables#ROS_IP.2BAC8-ROS_HOSTNAME
> 
> Benoit
> 
> 
> From: Ander Ansuategui 
> Sent: Thursday, September 08, 2011 10:57 AM
> To: ros-users at code.ros.org 
> Subject: [ros-users] Strange problem running ROS across multiple machines
> 
> Hi,
> 
> 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.
> 
> Regards.
> 
> Ander
> 
> 
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-- 
Lorenz Mösenlechner            | moesenle at in.tum.de
Technische Universität München | Karlstraße 45
80335 München                  | Germany
http://ias.cs.tum.edu/         | Tel: +49 (89) 289-26910