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Contrary to Dimitri's answer, I would suggest either publishing the scan message with "laser" as the frame_id, or extending your laser driver with the driver_base::Driver class (like what is done in the current hokuyo_node).

I do not think you need a transform publisher specifically for the laser if it is static. The turtlebot urdf can be updated with the laser link, and let robot_state_publisher handle the tf.

This way, your laser can be used for any other robots, or on its own, when needed.