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I find the same problem always appear when numbers of computers share the one master, but I just in one computer publish and subscribe the message ,why I have the same problem.
Maybe you have more than one NICs. For example, we usually have a Gigabyte Network Card and a Wi-Fi card in one laptop, if they all connect to the networks, ROS will be confused. You'd better add an extra line in you .bashrc file like:export ROS_IP=192.168.1.2 to declare which local IP you want to use. Then your ROS knows which NIC should be used.
Do you have ROS_IP set on each machine? It should be set to the IP of the machine
See http://wiki.ros.org/ROS/Tutorials/MultipleMachines for further details
Mark
Sorry I read " problem always appear when numbers of computers "
Which operating system are you using?
On any Linux (Ubuntu, Debian, Arch, etc) and on OSX, there should be an entry in your /etc/hosts file for localhost.
If you're on Linux or OSX, you should check that the file exists and that it has an entry for localhost.
I had same problem while ı am trying the upper link. I resolved, resolve is here.
open the .bashrc files and add this code.
You'll see those things like that:
export ROS_MASTER_URI=http://localhost (or something like that which is not your ip):11311
export ROS_HOSTNAME=(your machine name)
and you must change it like that:
export ROS_MASTER_URI=http://30.10.21.46:11311
export ROS_HOSTNAME=30.10.21.46
change your ip adress.
Asked: 2016-03-21 21:30:20 -0600
Seen: 3,500 times
Last updated: Mar 23 '16
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