Unable to move turtlebot or create map when using custom world in Gazebo.

asked 2019-07-01 11:17:54 -0500

MalarJN
25 ●8 ●10 ●13

updated 2019-07-25 13:17:48 -0500

jayess
6155 ●26 ●85 ●92

Hi,

I am new to using ROS (and Ubuntu) and am reaching out as I've hit a snag. I am trying to use the rtabmap_ros tutorial for mapping and navigation using turtlebot (the simulation portion) and am able to successfully create a map when using:

$roslaunch turtlebot_gazebo turtlebot_world.launch

$ roslaunch rtabmap_ros demo_turtlebot_mapping.launch simulation:=true

$ roslaunch rtabmap_ros demo_turtlebot_rviz.launch

However, when trying the same with a custom world that I've created, the world launches in Gazebo but

roslaunch rtabmap_ros demo_turtlebot_mapping.launch simulation:=true g

throws the following error:

Could not get transform from odom to base_footprint after 0.200000 seconds (for stamp=1466.802000)! Error="Could not find a connection between 'odom' and 'base_footprint' because they are not part of the same tree.Tf has two or more unconnected trees.. canTransform returned after 0.2 timeout was 0.2.

I used

rosrun tf view_frames

and see that odom is not connected to base_footprint. I am not sure how to rectify this.

I am essentially trying to simulate a turtlebot and make it autonomously (without having to use any manual intervention) move around an unknown location and create a map (SLAM) using Gazebo. If there are existing packages or codes that could help me with this please point me in the right direction. I use ROS Kinetic and Ubuntu 16.04 LTS.

Best regards, Malar.

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You forgot to include your error message, can you add it now?

kurshakuz ( 2019-07-01 11:33:52 -0500 )edit

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answered 2019-07-03 12:59:25 -0500

matlabbe

6409 ●11 ●96 ●80

Hi,

The problem is that TF odom -> base_footprint is not published by the robot, normally it should! I had the same problem on my computer. Here is what I did to solve the problem:

1) Make sure you have latest packages (it is recommended to clean/rebuild your catkin_ws afterwards):

$ sudo apt-get upgrade
$ rm -rf ~/catkin_ws/build/*
$ cd ~/catkin_ws
$ catkin_make

2) Make sure you installed ros-kinetic-kobuki-desktop (if you have environment variable TURTLEBOT_BASE=kobuki) so that libgazebo_ros_kobuki.so is available (used here), otherwise odometry won't be published.

$ sudo apt-get install ros-kinetic-kobuki-desktop

3) If you installed gazebo8 or gazebo9 on Kinetic, you have to rebuild ros-kinetic-kobuki-desktop from source (well the command 2 will fail because of incompatible gazebo versions)

4) When launching turtlebot_world.launch alone, you should have already /odom topic published:

$ roslaunch turtlebot_gazebo turtlebot_world.launch

$ rostopic hz /odom
subscribed to [/odom]
WARNING: may be using simulated time
average rate: 100.000
    min: 0.010s max: 0.010s std dev: 0.00000s window: 97
average rate: 100.000
    min: 0.010s max: 0.010s std dev: 0.00000s window: 197
average rate: 100.000
    min: 0.000s max: 0.050s std dev: 0.00944s window: 295

cheers,
Mathieu

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Thank you for helping me out Mathieu. However, I get the following error when running 'catkin_make': /home/malar/catkin_ws/src/navigation_2d/nav2d_operator/src/RobotOperator.cpp:11:66: error: no matching function for call to ‘costmap_2d::Costmap2DROS::Costmap2DROS(const char [10], tf2_ros::Buffer&)’ mLocalMap = new costmap_2d::Costmap2DROS("local_map", mTf2Buffer); ^ In file included from /home/malar/catkin_ws/src/navigation_2d/nav2d_operator/include/nav2d_operator/RobotOperator.h:12:0, from /home/malar/catkin_ws/src/navigation_2d/nav2d_operator/src/RobotOperator.cpp:4: /opt/ros/kinetic/include/costmap_2d/costmap_2d_ros.h:80:3: note: candidate: costmap_2d::Costmap2DROS::Costmap2DROS(std::__cxx11::string, tf::TransformListener&) Costmap2DROS(std::string name, tf::TransformListener& tf); ^ /opt/ros/kinetic/include/costmap_2d/costmap_2d_ros.h:80:3: note: no known conversion for argument 2 from ‘tf

MalarJN ( 2019-07-06 09:36:17 -0500 )edit

2_ros::Buffer’ to ‘tf::TransformListener&’ /opt/ros/kinetic/include/costmap_2d/costmap_2d_ros.h:72:7: note: candidate: costmap_2d::Costmap2DROS::Costmap2DROS(costmap_2d::Costmap2DROS&) class Costmap2DROS ^ /opt/ros/kinetic/include/costmap_2d/costmap_2d_ros.h:72:7: note: candidate expects 1 argument, 2 provided navigation_2d/nav2d_operator/CMakeFiles/RobotOperator.dir/build.make:62: recipe for target 'navigation_2d/nav2d_operator/CMakeFiles/RobotOperator.dir/src/RobotOperator.cpp.o' failed make[2]: * [navigation_2d/nav2d_operator/CMakeFiles/RobotOperator.dir/src/RobotOperator.cpp.o] Error 1 CMakeFiles/Makefile2:3158: recipe for target 'navigation_2d/nav2d_operator/CMakeFiles/RobotOperator.dir/all' failed make[1]: [navigation_2d/nav2d_operator/CMakeFiles/RobotOperator.dir/all] Error 2 Makefile:138: recipe for target 'all' failed make: ** [all] Error 2 Invoking "make -j1 -l1" failed

MalarJN ( 2019-07-06 09:36:57 -0500 )edit

Looks like more a navigation_2dbuild problem. They have binaries: http://wiki.ros.org/nav2d, you may try them instead of recompiling it.

matlabbe ( 2019-07-08 09:41:28 -0500 )edit

Hi Matlabbe, I get multiple errors like the one below: Err:1 http://packages.ros.org/ros/ubuntu xenial/main amd64 ros-kinetic-nav2d-msgs amd64 0.3.2-0xenial-20190320-174220-0800 404 Not Found [IP: 64.50.236.52 80] E: Failed to fetch http://packages.ros.org/ros/ubuntu/po... 404 Not Found [IP: 64.50.236.52 80] E: Unable to fetch some archives, try running apt-get update or apt-get --fix-missing.

MalarJN ( 2019-07-08 16:26:18 -0500 )edit

I tried both sudo apt-get update and sudo apt update. Both failed with: W: http://archive.canonical.com/dists/lu...: Signature by key 630239CC130E1A7FD81A27B140976EAF437D05B5 uses weak digest algorithm (SHA1) W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://packages.ros.org/ros/ubuntu xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654 W: Failed to fetch http://packages.ros.org/ros/ubuntu/di... The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654 W: Some index files failed to download. They have been ignored, or old ones used instead.

sudo apt-get upgrade seems to have worked though. But installing nav2d package still fails.

MalarJN ( 2019-07-08 16:27:49 -0500 )edit

Maybe related to this: https://answers.ros.org/question/3250...

matlabbe ( 2019-07-08 22:11:08 -0500 )edit

Thank you Matlabbe. That worked. I was able to follow nav2d and install the nav2d package and launch the tutorial. However, the catkin_make process still fails with the same error and I tried this suggestion. find_package fails with the following error:

bash: syntax error near unexpected token `catkin'

MalarJN ( 2019-07-09 15:27:37 -0500 )edit

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Unable to move turtlebot or create map when using custom world in Gazebo.

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