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How to solve md5sum error

Hello Everyone,

I am using ROS Noetic on Ubuntu 20.04. I am new to ROS and facing this issue :

[ERROR] [1667991720.986948870]: Client [/rviz_1667990140976545361] wants topic /tf_static to have datatype/md5sum [tf2_msgs/TFMessage/94810edda583a504dfda3829e70d7eec], but our version has [geometry_msgs/TransformStamped/b5764a33bfeb3588febc2682852579b0]. Dropping connection.

I tried reading and implementing few thing suggested by the community but it didn't work for me. So I am asking this again. Also, just for the clearance the .bag file which I am trying to run was of ROS2 but I converted it to ROS1. Could this be the issue?

KIndly help

Asked by draj on 2022-11-09 07:14:05 UTC

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Your question lacks concrete topic, details of things you tried to implement, code snippets, links, error logs etc. Please update your question.

Asked by ljaniec on 2022-11-09 08:27:31 UTC

Hello, I am trying to paste the error, but it i not being published [ERROR] [1667991720.986948870]: Client [/rviz_1667990140976545361] wants topic /tf_static to have datatype/md5sum [tf2_msgs/TFMessage/94810edda583a504dfda3829e70d7eec], but our version has [geometry_msgs/TransformStamped/b5764a33bfeb3588febc2682852579b0]. Dropping connection.

Asked by draj on 2022-11-09 09:17:57 UTC

@Ijaniec thank you for updating

Asked by draj on 2022-11-09 09:19:32 UTC

Perhaps your problem is the same as this one: https://answers.ros.org/question/261071/rviz-client-md5sum-error/?answer=302615#post-id-302615 or this one: https://answers.ros.org/question/261071/rviz-client-md5sum-error/?answer=302615#post-id-302615 or https://answers.ros.org/question/301834/dropping-connection-due-to-datatype-mismatch/

Asked by ljaniec on 2022-11-09 09:19:46 UTC

Answers

It looks like you are publishing message of type "geometry_msgs/TransformStamped" of /tf_static which expects /tf2_msgs/TFMessage. That does not work. A TFMessage contains multiple TransformStamped, but you need exactly the same types for publisher and subscriber.

Asked by NEngelhard on 2022-11-10 04:02:16 UTC

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