Bug in 4.3 Hands-on Practice!

Course Support ROS Basics In 5 Days (Python)
1

Hi there!

If I login and go straight to section 4, the Turtlebot sim does not start all the topics. I was looking for /cmd_vel and /odom.

If I go to section 2 and then jump to 4 fortunately the necessary topics needed in the exercise are working.

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@viorel.gheorghe
I apologize for that glitch. This looks like a temporary problem with the simulation, which is fixed when the simulation is restarted.

I was unable to reproduce it when I checked. Are you saying this happens all the time? If so, could you please tell me how to produce it exactly?

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Hi @bayodesegun

Yes, when I tried to enter again same problem with missing /odom.
I have pressed the RESTART SIMULATION (the robot reset icon is quite similar and can fool me :slight_smile: ).

It seems it appears in browser Brave if I close the page, but not the whole browser. When I entered directly in section 4 with a browser restart all was fine.

May I ask another thig or shall I put a new post?
On 4.5 Hands-on Practice!, with the custom Age.msg publishig I keep getting.

rosrun ex4_4_pkg ex4_4_age.py
Traceback (most recent call last):
  File "/home/user/catkin_ws/src/ex4_4_pkg/scripts/ex4_4_age.py", line 4, in <module>
    from ex4_4_pkg.msg import Age
ModuleNotFoundError: No module named 'ex4_4_pkg'

Solved by erasing /catkin_ws/devel and /catkin_ws/build and redo all with catkin make

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Using the Brave browser is sort of brave :slight_smile: as it’s not officially supported yet.

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