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Client [/rviz_15....] wants topic /odom to have datatype/md5sum [sensor_msgs/PointCloud/d8....], but our version has [nav_msgs/Odometry/cd... Dropping connection.

asked 2019-04-23 20:39:54 -0500

CharlieD gravatar image

updated 2019-04-25 08:29:18 -0500

I’m getting this error: The robot launch file starts and all appears good. I start rviz then I get one Pose array dataset then this error

[ERROR] [1556066738.031123079]: Client [/rviz_1556066697211260013] wants topic /odom to have datatype/md5sum [sensor_msgs/PointCloud/d8e9c3f5afbdd8a130fd1d2763945fca], but our version has [nav_msgs/Odometry/cd5e73d190d741a2f92e81eda573aca7]. Dropping connection.

This message seems to indicate the required data type should be [sensor_msgs/PointCloud] However, all the ROS info seems to indicate the proper /odom data type is [nav_msgs/Odometry] At this time I suspect a AMCL or a RVIZ setup issue

Here is the AMCL launch file

<node pkg="amcl" type="amcl" name="amcl" output="screen">
  <!-- Publish scans from best pose at a max of 10 Hz -->
  <param name="odom_model_type" value="diff"/>
  <param name="odom_alpha5" value="0.1"/>
  <param name="transform_tolerance" value="0.5"/>
  <param name="initial_pose_x" value="-3.8"/>
  <param name="initial_pose_y" value="6.0"/>
  <param name="initial_pose_a" value="0.5"/>
  <param name="gui_publish_rate" value="1.0"/>
  <param name="laser_max_beams" value="30"/>
  <param name="min_particles" value="500"/>
  <param name="max_particles" value="5000"/>
  <param name="kld_err" value="0.05"/>
  <param name="kld_z" value="0.99"/>
  <param name="odom_alpha1" value="0.2"/>
  <param name="odom_alpha2" value="0.2"/>
  <!-- translation std dev, m -->
  <param name="odom_alpha3" value="0.8"/>
  <param name="odom_alpha4" value="0.2"/>
  <param name="laser_z_hit" value="0.5"/>
  <param name="laser_z_short" value="0.05"/>
  <param name="laser_z_max" value="0.05"/>
  <param name="laser_z_rand" value="0.5"/>
  <param name="laser_sigma_hit" value="0.2"/>
  <param name="laser_lambda_short" value="0.1"/>
  <param name="laser_lambda_short" value="0.1"/>
  <param name="laser_model_type" value="likelihood_field"/>
  <!-- <param name="laser_model_type" value="beam"/> -->
  <param name="laser_likelihood_max_dist" value="2.0"/>
  <param name="update_min_d" value="0.2"/>
  <param name="update_min_a" value="0.5"/>
  <param name="odom_frame_id" value="odom"/>
  <param name="resample_interval" value="1"/>
  <param name="transform_tolerance" value="0.5"/>
  <param name="recovery_alpha_slow" value="0.0"/>
  <param name="recovery_alpha_fast" value="0.0"/>

4/25/2019 - Thank you gvdhoorn for boosting my karma - I will keep my images limited to GUI's - Charlie

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You are correct, this is almost certainly an issue with your rviz config. Can you post your rviz config file or a screenshot of rviz?

ahendrix gravatar image ahendrix  ( 2019-04-24 00:16:58 -0500 )edit

I second @ahendrix. As you haven't posted the config yet: I don't think this has anything to do with the particlecloud. Check your configured display types, identify the one that is used to display a pointcloud and check if the topic configured there is called odom. If yes, remove and you should be good to go.

More hints to debug: rostopic info /odom should show you who is trying to publish/subscribe, rosnode info <NODE> should give you more info about the types the respective nodes expect.

mgruhler gravatar image mgruhler  ( 2019-04-25 00:44:30 -0500 )edit

evidently I cannot post images

@CharlieD: I've given you sufficient karma to post a screenshot.

Know that this (ie: as a GUI is involved) is just about the only situation in which posting a screenshot makes sense.

gvdhoorn gravatar image gvdhoorn  ( 2019-04-25 01:59:20 -0500 )edit

1 Answer

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answered 2019-04-25 08:31:40 -0500

gvdhoorn gravatar image

Your screenshot shows that you have a PointCloud display (the last one) where you have the Topic field set to odom. That is most likely the cause of your problems: the odom topic rarely carries sensor_msgs/PointCloud2 messages, so that is not going to work.

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This was the issue, I deleted the PointCloud display and the error disappeared. I was able to manually drive the robot around and the PoseArray updated as expected. Thank You

CharlieD gravatar image CharlieD  ( 2019-04-25 09:35:51 -0500 )edit

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Asked: 2019-04-23 20:39:54 -0500

Seen: 3,821 times

Last updated: Apr 25 '19