When I do step 4. I got understands view.
Have you followed all the previous steps fully? If you skip any of the steps, the others will not work as expected.
Yes, I followd all the previous steps fully.
It should work then. I can confirm it works when all the steps are followed and there are no errors.
Please review the unit from the beginning again and repeat all the steps. If it doesn’t work after that, please send us a short screencast showing the execution of each step.
I did all the steps again, but he still says that the two_rover_heartbeat.launch.py is not a possible command.
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Before running the program after compiling, you should source the terminal:
source ~/ros2_ws/install/setup.bash