No laser scan received (and thus no pose updates have been published) for 18.974000 seconds. Verify that data is being published on the /scan topic

Question

Hi all, i already searched this question on all over answers.ros.org, but i didnt found answer on the issue i have. I built a custom 4 wheel bot and i added a navigation stack(map, move_base, amcl and other param yaml files) on it. if i run the launch file, i get this error,

[ WARN] [1656224367.752167333, 18.974000000]: No laser scan received (and thus no pose updates have been published) for 18.974000 seconds. Verify that data is being published on the /scan topic.

so, the issue i have is even if i see the map in rviz, there are no particle filters i can see detected by laser.Which describes the error i mentioned above. i clearly understand that my bot doesnt localize at first, leads to cant set a navigate and set a goal to my bot on the map.

I have been trying to solve this issue since last 3 days. Would be glad to have some guidance. Thanks in advance.

Regards.

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Originally posted by the_one on ROS Answers with karma: 41 on 2022-06-26

Post score: 0

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Original comments

Comment by tianb03 on 2022-06-28:
You'd better provide the result when executing roswtf, and the tf tree in rqt. It is easier for others to debug

Comment by the_one on 2022-06-29:
thank u for ur reply Sure, i attached a link of drive here, which has all the image files(error) in it...for your reference.

link text

i named those files with respect to the errors...

thanks in advance.

Comment by tianb03 on 2022-07-02:
any output from the /scan topic using rostopic echo?

Answer 1

Hi, after many consideration and references, i finally got cleared that issue. Fault is on me. I did the mistake on topic name. Its working now. After that i wanted to scan the map(turtlebot3 house) with my bot, but it ended up like this. Also if i run the launch file, the bot behaves like this. Idk why the bot behaves like. Thanks in advance.

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Originally posted by the_one with karma: 41 on 2022-07-02

This answer was ACCEPTED on the original site

Post score: 0