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My guess is that you don't have ROS_IP set correctly. A resolvable ROS_IP is required for the rostopic echo node to be fully connected with your publisher. You should be able to verify that the connection exists using rxgraph. You should also set ROS_IP on both machines.

You can read more about ROS_IP here

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Added link to Network Setup

My guess is that you don't have ROS_IP set correctly. A resolvable ROS_IP is required for the rostopic echo node to be fully connected with your publisher. You should be able to verify that the connection exists using rxgraph. You should also set ROS_IP on both machines.

You can read more about setting up your network here.

You can read more about ROS_IP here.