Network Setup Problem

Question

Hello everyone,

I want to setup a connection between my robot and my laptop. I had done it successfully like a thousand times before but this time something went wrong and now, I am unable to locate the problem. Here are the details:

This is the error message:

Unable to contact my own server at [http://192.168.10.200:59534/]. This usually means that the network is not configured properly.

A common cause is that the machine cannot ping itself. Please check for errors by running:

    ping 192.168.10.200

For more tips, please see

http://www.ros.org/wiki/ROS/NetworkSetup

IPs of the machines:

IP of the robot: 192.168.10.200

My IP: 192.168.10.199

On my laptop, exports are as follows:

export ROS_MASTER_URI=http://192.168.10.200:11311

export ROS_IP=192.168.10.200

Every ping combination works and also netcat tests are successful.

Furthermore, when I start both machines with this configurations and start roscore on my robot, I am able to see the topics on my laptop by typing

rostopic list

This means that the robot and my laptop can indeed communicate. However, when I try to run a node from the laptop I got the error message given above.

I performed an exhaustive search on almost all the combinations of ROS_xxx environment variables (which are related with network setup) and /etc/hosts file entries on both machines with no luck.

Hope someone guides me through these complicated configurations.

Thanks in advance.

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Originally posted by yigit on ROS Answers with karma: 796 on 2014-01-06

Post score: 2

Answer 1

ROS_IP should be the IP address of the machine that it's set on, not the IP of the master.

Thus, on your laptop ROS_IP should be set to 192.168.0.199

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Originally posted by ahendrix with karma: 47576 on 2014-01-06

This answer was ACCEPTED on the original site

Post score: 1

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Original comments

Comment by yigit on 2014-01-07:
I would never have noticed that. Thanks a lot.