No data from SSH Connection

edit

EDIT: Solved, see solution at the bottom of this comment.

I'm trying to get two computers set up to communicate between ROS. I set up SSH, and can access the terminals of each computer from the other. (One is Ubuntu 12.04 and the other is 13.04). From one computer, I try to run this tutorial:

wiki.ros.org/ROS/Tutorials/MultipleMachines

I did the tutorial using one computer. The other master already had roscore running on it. To start the listener on this machine, I did

ssh <master>@<master's IP>
export ROS_MASTER_URI=http://<master>@<master's IP>:11311
rosrun rospy_tutorials listener.py

When I run this, the listener doesn't print anything, but looks ready to print. In a new terminal, I used the main computer as the slave to run

export ROS_MASTER_URI=http://<master>@<master's IP>:11311
rosrun ropsy_tutorials talker.py

and ran the talker, which continuously printed lines like:

[INFO] [WallTime: 1406648603.610351] hello world 1406648603.61

With everything closed, I tried to see if the slave computer could subscribe to topics on the other computer, with ROS and some nodes already running from earlier. I did

rostopic list

in a new terminal and it said

ERROR: Unable to communicate with master!

I did

export ROS_MASTER_URI=http://<master>@<master's IP>:11311

and then tried to list the topics, and they all listed. When I did

rostopic echo /joint_states

nothing printed. It looked like it was ready to print, but nothing did. I tried

ssh <master>@<master's IP>
rostopic echo /joint_states

and the info printed out no problem.

Does anyone know what the issue is? I never got any error codes. When I tried the tutorial again, using

export ROS_MASTER_URI=http://<master's hostname>:11311

instead, I got this error:

Unable to register with master node [http://<master's hostname>:11311]: master may not be running yet. Will keep trying.

Thanks!

SOLUTION:

First terminal:

ssh <master>@<master's IP>
export ROS_IP=<master's IP>
roscore

Second terminal:

ssh <master>@<master's IP>
export ROS_IP=<master's IP>
export ROS_MASTER_URI=http://<master's IP>:11311
rosrun rospy_tutorials listener.py

Third Terminal:

export ROS_MASTER_URI=http://<master's IP>:11311
export ROS_IP=<slave's IP>
rosrun rospy_tutorials talker.py