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I think first you need to figure out if the LiDAR is connected to the computer or not, if the IP address is 192.168.1.77 as mentioned, try pinging it. If it doesn't return anything then that's not the IP address, by default the VLP-16 IP address is 192.168.1.201. Also, before you use rostopic echo \topic you should first run rostopic list to display the topics being published.

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