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Map frame not being published in tutorial #9

Description

@dallinbriggs

I have been following the tutorial for basic navigation and it appears that whatever node is supposed to be publishing the map frame isn't doing it. Steps to reproduce:

  • Installed the dependencies in a docker container running ros melodic.
  • Built the package.
export TURTLEBOT3_MODEL=burger
roslaunch turtlebot3_gazebo turtlebot3_world.launch
roslaunch mbf_beginner amcl_demo_relay_subscriber.launch
roslaunch mbf_beginner rviz.launch

At this point, I get the following error:

[ WARN] [1667867096.158526508, 1743.710000000]: Timed out waiting for transform from base_footprint to odom to become available before running costmap, tf error: canTransform: target_frame odom does not exist.. canTransform returned after 0.1 timeout was 0.1.
[ WARN] [1667867100.330887632, 1747.876000000]: No laser scan received (and thus no pose updates have been published) for 1747.876000 seconds.  Verify that data is being published on the /scan topic.

Indeed, the scan topic is not being published. I'm not sure if that is the root of the map issue or not.

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