ros2 bag play not working - "Opened database '<bagname>.db3' for READ_ONLY

[juliaivonne]

Description

I am trying to play a ROS2 bag folder which contains a metafile.yaml-file and a bag.db3-file. I am trying to play the bag in ROS2 (Ubuntu 20.04, ROS2 Foxy) with the command ros2 bag play test3 (where test 3 is the name of the bag), but for some reasons the topics won't get published.

Expected Behavior

The topics are published and I can use them, for example in rviz2.

Actual Behavior

When I am trying to publish the topics with ros2 bag play test3m where _test 3_, I get the respond:

[INFO] [1719414561.512699846] [rosbag2_storage]: Opened database 'test3/test3.db3' for READ_ONLY.

Also, when I am typing ros2 topic echo <topicname>, ROS2 says:

WARNING: topic [] does not appear to be published yet Could not determine the type for the passed topic.

The bagfile itself seems fine to me. The metafile.yaml-file makes sense and I get info from ros2 bag info test3:

Files: test3.db3 Bag size: 64.2 MiB Storage id: sqlite3 Duration: 22.360s Start: Mar 1 2024 11:28:55.934 (1709288935.934) End: Mar 1 2024 11:29:18.294 (1709288958.294) Messages: 3355 Topic information: Topic: | Type: ros_can_gps_msg/msg/gpsData | Count: 2237 | Serialization Format: cdr Topic: | Type: sensor_msgs/msg/PointCloud2 | Count: 559 | Serialization Format: cdr Topic: | Type: visualization_msgs/msg/MarkerArray | Count: 559 | Serialization Format: cdr

Also, the topics are not shown in the topic list in rviz2.

I used 2 different ROS2-bags. One is a converted one from a ROS1-bag (with https://github.com/rpng/rosbags). The other one is a recorded turtlesim bag (I followed https://docs.ros.org/en/foxy/Tutorials/Beginner-CLI-Tools/Recording-And-Playing-Back-Data/Recording-And-Playing-Back-Data.html). I get the same results.

I installed Ubuntu & ROS again on another laptop, but nothing changed.

To Reproduce

Run ros2 bag play <any ROS2 bag>

System (please complete the following information)

• OS: Ubuntu 20.04
• ROS 2 Distro: Foxy
• Install Method: Debian (https://docs.ros.org/en/foxy/Installation/Ubuntu-Install-Debians.html), Deskop Version

Additional context

** I am complete newbie to ROS & Ubuntu :) Thank you!**