# Mpa to ros

Source: https://forum.modalai.com/topic/1835/mpa-to-ros
Category: VOXL 2 and VOXL 2 Mini (https://forum.modalai.com/category/26/voxl-2-and-voxl-2-mini)
Tags: voxl-2
Posted: 2023-02-16 00:45:01 UTC by SAGAR SARKAR
Replies: 5 · Views: 1126

## SAGAR SARKAR · 2023-02-16 00:45:01 UTC

I wrote a subscriber node to get the ‘data’ field of the ‘sensor_msgs/Img’ for rostopic ‘/tracking’. But not getting any output. I even tried echoing the topic, but still no output. Can someone explain the reason? The required services are already enabled and running.

## Reply by SAGAR SARKAR · 2023-02-16 00:47:36 UTC

![Voxl inspect services.png](https://forum.modalai.com/assets/uploads/files/1676508389515-voxl-inspect-services.png)

## Reply by 張為超 · 2023-02-17 10:30:17 UTC

If you rostopic list on your pc does it show any topic ?

## Reply by SAGAR SARKAR · 2023-02-19 20:55:17 UTC (in reply to 張為超)

@張為超 Yes it does. Voxl2 is the master. I am running the voxl mpa to ros node in voxl2 and then trying to echo the published topics in my PC.

## Reply by 張為超 · 2023-02-20 02:02:18 UTC

I think you can use voxl protal first to check if the camera configure is okay, then use "rqt_image_view" in ros to check ros configure.

## Reply by SAGAR SARKAR · 2023-02-21 15:52:24 UTC (in reply to 張為超)

@張為超 It worked. I setup my Pc as the master this time, and it worked in that way.