# VEHICLE VISUAL ODOMETRY NOT PUBLISHING

Source: https://forum.modalai.com/topic/4651/vehicle-visual-odometry-not-publishing
Category: VOXL SDK and Software (https://forum.modalai.com/category/47/voxl-sdk-and-software)
Tags: ros
Posted: 2025-08-04 20:28:13 UTC by taiwohazeez
Replies: 1 · Views: 2002

## taiwohazeez · 2025-08-04 20:28:13 UTC

Hi support, 

I Have a starling 2 drone with ROS2 FOXY installed on it, when i run ros2 ropic list, i see the visual odometry as an available topic, but ros2 topic echo /fmu/in/vehicle_visual_odometry
isnt publishing anything, its just stucked. This on the other hand, ros2 topic echo /ov/odom
 is working, so I know that my QVIO is running properly. 

What can I do.

THanks,
Taiwo

## Reply by teddy.zaremba · 2025-08-06 21:15:21 UTC

Hi @taiwohazeez,

The " /fmu/in" prefix is used for sending data to the autopilot - you're never going to receive data from the autopilot listening to that topic. 

Look at the "/fmu/out" topics to see messages coming from the autopilot.

Best,
Ted