Why Does RealSense D457 Fail to Initialize in ROS2?

A frame starts at the camera sensor, crosses the USB link into the Jetson host, passes host device permissions into the development container, enters the RealSense ROS node, and finally appears as a ROS2 topic for the visual SLAM node and diagnostic subscribers. Follow that path in order. A silent frequency check is only the last symptom; it does not identify which upstream hop stopped the data.

Where does the RealSense data path stop?

The initial launch reached the ROS processes but stopped at USB device control. The RealSense node reported failed to set power state, followed by The requested device with is NOT found. Will Try again. Because the node could not place the camera in its required power state, it never reached sensor profile configuration or image publication.

The software versions in both launch attempts were RealSense ROS v4.51.1, built and running with LibRealSense v2.55.1. The failure therefore changed without a wrapper or runtime library version change; the decisive difference was restoration of host-side device access.

Check before continuing: Do not troubleshoot ROS topic frequency until the power-state error and repeated device-not-found message have disappeared.

How do I establish USB access before starting the container?

Layer one comes first. The camera was connected through USB 3.2, but link type alone does not grant a containerized process permission to issue device-control requests. RealSense udev rules must exist on the Jetson host, outside the development container. Installing rules only inside a disposable container does not correct the host device permissions used when the USB device is attached.

Use either of these host-side procedures:

1. Before starting the isaac_ros-dev Docker container with run_dev.sh, run setup_udev_rules.sh from Librealsense in a terminal outside Docker.
2. Alternatively, check whether 99-realsense-libusb.rules exists in /etc/udev/rules.d/. If it is absent, disconnect the camera, copy that rule file into /etc/udev/rules.d/, and reconnect the camera.
3. Start the development container only after the host has applied the rule to the reconnected device.
4. Launch the stack with ros2 launch isaac_ros_visual_slam isaac_ros_visual_slam_realsense.launch.py.

Reconnection matters because udev applies matching rules when it processes a device event. A rule file that appears after the camera was enumerated does not retroactively change the already-created device node unless the rule is reloaded and the device event is retriggered. Disconnecting and reconnecting supplies that event without relying on an unspecified host command.

Check before continuing: The next launch must identify a device by serial number instead of cycling between the power-state and device-not-found errors.

Did ROS select the camera that the installation expects?

The recovered launch discovered serial number 220422302040, physical ID 2-3.2-3, and port number 2-3.2. It also reported USB type 3.2, firmware 5.16.0.1, and product ID 0x0B5C. These fields prove that the host-to-container-to-Librealsense discovery path is operational.

The model discrepancy is operationally significant. A launch described for a D457 discovered a device whose own report named it D455. The serial number and product ID are stronger selection evidence than an assumed camera label. Confirm the physical unit, cable path, and any serial-based selection so that troubleshooting does not proceed against the wrong attached camera.

The node also reported JSON file is not provided and Sync Mode: Off. These are configuration observations, not explanations for the earlier permission failure. They become relevant only if the intended SLAM configuration requires a JSON configuration or external synchronization.

Check before continuing: Match 220422302040, 0x0B5C, and the reported D455 name to the camera that should supply the SLAM images.

Did the stereo and motion sensors actually open?

Device discovery alone does not prove data acquisition. After recovery, the node stopped and restarted the Stereo Module, then opened two infrared profiles. It also stopped and restarted the Motion Module before opening accelerometer and gyroscope profiles.

The messages re-enable the stream for the change to take effect. appeared before the stop/start sequence. A setting was changed while a stream was active, and the node handled that condition by cycling the affected sensor. The later open-profile messages are the checkpoint: they identify what the driver requested from each sensor. Finally, RealSense Node Is Up! proves that node initialization completed.

An open profile reports configuration, not receipt by a particular ROS subscriber. The configured 90 FPS is therefore not yet a measured publication rate. A frequency tool can report only samples that reach its subscription.

Check before continuing: Require the Infra(1) open-profile message and RealSense Node Is Up! before investigating /camera/infra1/image_rect_raw.

Why can the ROS2 frequency command remain silent?

The command ros2 topic hz /camera/infra1/image_rect_raw --window 20 measures arrival timestamps over a 20-sample window. It does not start the camera, enable an infrared stream, repair device permissions, or create a missing publisher. No output means that the command has not accumulated samples it can measure.

The visual SLAM component used cuVSLAM 11.4. Its successful library load and GPU warm-up concern the consumer side of the path. Those messages cannot substitute for proof that the RealSense publisher emitted an image. Likewise, the recovered run took 15.233617 seconds for CUVSLAM_WarmUpGPU(); run the topic check against the live system after startup activity completes rather than interpreting a quiet diagnostic during initialization as a steady-state rate.

Check before continuing: Confirm that the running ROS graph contains an active publisher under the exact /camera/infra1/image_rect_raw name and that the diagnostic terminal participates in the same graph.

How do I isolate publication from visual SLAM processing?

Treat the camera publisher and SLAM consumer as separate checkpoints. The launch started realsense2_camera_node-2 and component_container-1 as separate processes. The component container loaded libvisual_slam_node.so and instantiated nvidia::isaac_ros::visual_slam::VisualSlamNode; neither action proves that an image crossed the ROS transport.

1. Keep the launch terminal visible and confirm that the camera no longer retries device discovery.
2. Read the discovered serial number, model name, USB type, firmware, and product ID. Stop if the selected physical camera is not the intended unit.
3. Confirm that Infra(1) opened as Y8 at 640 × 360 and 90 FPS.
4. Confirm that the RealSense node reaches RealSense Node Is Up!.
5. In the diagnostic terminal, verify the exact namespace used by the live camera node. A remap or namespace change can place the image under a different name even when the sensor is streaming.
6. Verify that the diagnostic terminal and container share the same ROS discovery environment. A process outside the relevant container or ROS domain can see no samples despite a functioning local publisher.
7. Check publisher/subscriber QoS compatibility for the image stream. Image pipelines commonly favor timely sensor samples; a diagnostic subscription must request a compatible policy.
8. Run ros2 topic hz /camera/infra1/image_rect_raw --window 20 only after those checkpoints pass.

Check before continuing: The frequency command must begin printing measured results; the open-profile value of 90 FPS is a configuration target, not the measurement itself.

How do I perform the end-to-end commissioning check?

Run one ordered test without changing cabling, camera selection, or launch configuration between checkpoints. This prevents a valid observation from one hardware state being combined with a later observation from another.

1. On the Jetson host, verify that 99-realsense-libusb.rules is present in /etc/udev/rules.d/, or run setup_udev_rules.sh outside Docker.
2. Reconnect the camera so the host applies the rule, then start the development container with run_dev.sh.
3. Launch isaac_ros_visual_slam_realsense.launch.py through the recorded ROS2 launch command.
4. Reject the run if failed to set power state or the device-not-found retry returns.
5. Confirm discovery of serial 220422302040 on USB type 3.2, then resolve why the device reports D455 when the planned camera is D457.
6. Confirm the two infrared profiles at 640 × 360, Y8, and 90 FPS, followed by RealSense Node Is Up!.
7. Confirm that the image publisher uses /camera/infra1/image_rect_raw in the same ROS graph as the diagnostic terminal.
8. Run ros2 topic hz /camera/infra1/image_rect_raw --window 20 and require repeated frequency reports before accepting the camera-to-ROS path.

Check before continuing: Accept the commissioning result only when the frequency output is live and the serial number, reported model, open profile, and topic name all belong to the same uninterrupted launch.

FAQ