rostopic publish message to remote machine?

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Hi folks,

I'm trying to connect to ROS running on a remote machine. I can remotely echo the topics from the machine however I cannot publish anything.

rostopic echo /odom

works like a charm, printing all the odom messages published by the remote ROS on my local laptop.

rostopic pub /cmd_vel geometry_msgs/Twist -- "<some twist="" data="">"

however does not. I have traced the communication using Wireshark and all I can see are some registerService, registerPublisher and getParam commands. My message however doesn't arrive. I've also tried to simply publish a std_msgs/String to a topic called /blubb. But even that does not work. I cannot see the message itself on the network (however I can see the mentioned remote procedure calls) and thus it doesn't arrive at the remote machine.

ROS_IP is set to the remote machine's IP on both machines. ROS_MASTER_URI is set to http://<remoteip>:11311 on both machines.

netcat works, rostopic echo does, rqt_plot does, even rviz does using the remote connection. I just can't send messages to the remote machine.

Any idea what might be wrong?

Thanks a lot!

Cheers, Hendrik