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The problem is

<param name="use_sim_time" value="true"/>

This means the uses simulation time published to /clock topic by e. g. Gazebo or a rosbag started by rosbag play --clock file.bag.

See this http://wiki.ros.org/Clock ans this http://answers.ros.org/question/193820/time-stamp-ros_info/?comment=193890#comment-193890 for info about clock and simulation time

This means your node will not spin before any other node (gazebo/rosbag) is started and publishes to /clock topic

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