[ros-users] How to use GazeboRosBlockLaser

Hi,
I am a beginner of ROS and trying to use Gazebo in ROS. I created a urdf
file that creates a erratic robot with a block laser on it and successfully
commanded robot but I cannot figure out how to get data from block laser. I
searched ROS wiki but I cannot find anything.

Is there any example code or source about that?

Thanks.
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