Could this be a problem? Because I am timestamping the messages on the laptop so I don't think it should matter at all! Please correct me if I am wrong. -- View this message in context: http://ros-users.122217.n3.nabble.com/Tf-failure-while-working-with-a-Pioneer-P3DX-tp2003281p2004232.html Sent from the ROS-Users mailing list archive at Nabble.com.