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Can you tell us what version of Gazebo you're using?

It's Ignition Gazebo Fortress, installed from packages on an Ubuntu 22.04 in a virtualbox on Windows.

Today it does load the model, so I think this must have been a temporary server-side issue (I'm fairly sure I also got the 404 with the full path).

It still doesn't work though (complains about several libraries not found).

In the mean time I have compiled Gazebo Garden and Rolling from source, as well as the ros_gz_bridge (and for the latter also gps_msgs).

This seems to work, except that the bridge errors:

[WARN] [1679564767.107537388] [ros_gz_bridge]: Failed to create a bridge for topic [/model/vehicle_blue/cmd_vel] with ROS2 type [geometry_msgs/msg/Twist] to topic [/model/vehicle_blue/cmd_vel] with Gazebo Transport type [ignition.msgs.Twist]

This seems rather obvious, as there is no topic cmd_vel? Although it's not listed in the official tutorial either?

ign topic -l
/clock
/gazebo/resource_paths
/gui/camera/pose
/model/vehicle_blue/odometry
/model/vehicle_blue/tf
/stats
/world/visualize_lidar_world/clock
/world/visualize_lidar_world/dynamic_pose/info
/world/visualize_lidar_world/pose/info
/world/visualize_lidar_world/scene/deletion
/world/visualize_lidar_world/scene/info
/world/visualize_lidar_world/state
/world/visualize_lidar_world/stats`

Can you tell us what version of Gazebo you're using?

It's Ignition Gazebo Fortress, installed from packages on an Ubuntu 22.04 in a virtualbox on Windows.

Today it does load the model, so I think this must have been a temporary server-side issue (I'm fairly sure I also got the 404 with the full path).

It still doesn't work though (complains about several libraries not found).

In the mean time I have compiled Gazebo Garden and Rolling from source, as well as the ros_gz_bridge (and for the latter also gps_msgs).

This seems to work, except that the bridge errors:

[WARN] [1679564767.107537388] [ros_gz_bridge]: Failed to create a bridge for topic [/model/vehicle_blue/cmd_vel] with ROS2 type [geometry_msgs/msg/Twist] to topic [/model/vehicle_blue/cmd_vel] with Gazebo Transport type [ignition.msgs.Twist]

This seems rather obvious, as there is no topic cmd_vel? Although it's not listed in the official tutorial either?

ign topic -l
/clock
/gazebo/resource_paths
/gui/camera/pose
/model/vehicle_blue/odometry
/model/vehicle_blue/tf
/stats
/world/visualize_lidar_world/clock
/world/visualize_lidar_world/dynamic_pose/info
/world/visualize_lidar_world/pose/info
/world/visualize_lidar_world/scene/deletion
/world/visualize_lidar_world/scene/info
/world/visualize_lidar_world/state
/world/visualize_lidar_world/stats`

Can you tell us what version of Gazebo you're using?

It's Ignition Gazebo Fortress, installed from packages on an Ubuntu 22.04 in a virtualbox on Windows.

Today it does load the model, so I think this must have been a temporary server-side issue (I'm fairly sure I also got the 404 with the full path).

It still doesn't work though (complains about several libraries not found).

In the mean time I have compiled Gazebo Garden and Rolling from source, as well as the ros_gz_bridge (and for the latter also gps_msgs).

This seems to work, except that the bridge errors:

[WARN] [1679564767.107537388] [ros_gz_bridge]: Failed to create a bridge for topic [/model/vehicle_blue/cmd_vel] with ROS2 type [geometry_msgs/msg/Twist] to topic [/model/vehicle_blue/cmd_vel] with Gazebo Transport type [ignition.msgs.Twist]

This seems rather obvious, as there is no topic cmd_vel? Although it's not listed in the official tutorial either?

ign topic -l
/clock
/gazebo/resource_paths
/gui/camera/pose
/model/vehicle_blue/odometry
/model/vehicle_blue/tf
/stats
/world/visualize_lidar_world/clock
/world/visualize_lidar_world/dynamic_pose/info
/world/visualize_lidar_world/pose/info
/world/visualize_lidar_world/scene/deletion
/world/visualize_lidar_world/scene/info
/world/visualize_lidar_world/state
/world/visualize_lidar_world/stats`

EDIT: I learned that:

1. Contrary to ROS 2, topics that have listeners only are not shown in gz topic -l,. This will thankfully be fixed soon.

2. Obviously the bridge command failed, as ignition.msgs.Twist has been renamed to gz.msgs.Twist.

It is working now, thank you.