The topics do not appear (vrpn_client_ros)

I want to send the data of posision of the cameras optitrack (windows pc) to ros (ubuntu pc). I was reading many forums and decided to choose the method vrpn_client_ros.

In Motive I have the vrpn broadcast option with ip ( and a port: 3883. I made a LAN with a router where the windows pc has an ip ( and the Ubuntu pc has an ip (

When I run the launch file (roslaunch vrpn_client_ros sample.launch server: = “”) on a terminal, I get the answers: “Connecting to VRPN server at” and “Connection established”.

My problem is that the topics published do not appear, and therefore I can not get the position data in ros.

How can I solve this problem?

Do I have to modify the launch file?