ROS mocap_optitrack version problem

[janna_lam]

When I launch

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roslaunch mocap_optitrack mocap.launch

, it says that "[WARN]: could not get server version, using auto." I launched this file in the terminal, whose ROS_MASTER is set to another address. I'm not sure if it is because I must launch this file directly on the master, no mocap related topics show up except for

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/mocap_node/optitrack_config/parameter_descriptions

or

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/mocap_node/optitrack_config/parameter_updates

are visible in the rostopic list. However, if I launch this file on the master terminal, the names of the related topics are visible by

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rostopic list

now, but no data is streaming out. What could be the possible reasons and solutions?