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In the pointcloud display in rviz under "Status", do you see that the one message arrived in rviz?

What is your 'Fixed Frame' (Global Options in rviz)? Set it to 'laser_link', or make sure there is a tf transform from the fixed frame to laser_link.

I'm not sure how exactly rviz handles timestamps, maybe the 0 timestamp of the message is an issue (but I guess it should still display).

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