Rosjava: Problem sending a string to the sample

Question

Dear all,

I am playing around with the rosjava tutorial. When running the Listener node together with the talker node it works fine and the Hello world is printed out. But if I run

rostopic pub /chatter std_msgs/String "Hello"

It will not work anymore. The listener throws the following exceptions:

01.02.2012 14:52:15 org.ros.internal.node.topic.UpdatePublisherRunnable run
SCHWERWIEGEND: java.lang.RuntimeException: java.net.ConnectException: Connection refused
01.02.2012 14:52:17 org.ros.internal.node.topic.UpdatePublisherRunnable run
SCHWERWIEGEND: org.ros.exception.RosRuntimeException: Connection exception:   eich-ThinkPad/192.168.103.42:39099
01.02.2012 14:52:17 org.ros.internal.transport.ConnectionTrackingHandler exceptionCaught
SCHWERWIEGEND: Channel exception: java.net.NoRouteToHostException: No route to host
01.02.2012 14:52:17 org.ros.internal.transport.ConnectionTrackingHandler exceptionCaught
SCHWERWIEGEND: Channel exception: java.net.NoRouteToHostException: No route to host

---

Originally posted by Markus Eich on ROS Answers with karma: 202 on 2012-02-01

Post score: 0

Answer 1

I solved the issue temporarily be setting ROS_IP to 127.0.0.1. How can I tell the Listener Sample node to use the external IP of my machine? Is the Listerner Sample node bound to localhost?

---

Originally posted by Markus Eich with karma: 202 on 2012-02-13

This answer was ACCEPTED on the original site

Post score: 0

---

Original comments

Comment by Martin Günther on 2012-02-14:
Something is wrong with your network configuration. You shouldn't get a "no route to host" exception when trying to connect to your own external IP.

Comment by damonkohler on 2012-02-23:
Have you tried setting ROS_IP to your external IP? 192.168.103.42 in your example log output.