# MAVLink 1

Source: https://forum.modalai.com/topic/1474/mavlink-1
Category: Flight Core and Legacy VOXL (https://forum.modalai.com/category/9/flight-core-and-legacy-voxl)
Tags: voxl
Posted: 2022-10-20 11:45:20 UTC by JP Drone
Replies: 5 · Views: 1124

## JP Drone · 2022-10-20 11:45:20 UTC

voxl-mavlink seems to support only MAVLink 2.
https://gitlab.com/voxl-public/voxl-sdk/third-party/voxl-mavlink/-/tree/master/files

The third-party application I use uses MAVLink1 in part, which results in an error (actually no response).
Do you plan to support MAVLink v1.0 in the future?

## Reply by JP Drone · 2022-10-22 01:51:36 UTC

To reproduce:
 set MAV_PROTO_VER to 1 (always use version 1)
VOXL cannot get any information from PX4.

## Reply by Eric Katzfey (ModalAI staff) · 2022-10-22 15:49:05 UTC (in reply to JP Drone)

@JP-Drone Until now we didn't know that there was a use case for v1.0. What is the third party application?

## Reply by JP Drone · 2022-10-24 05:20:01 UTC (in reply to Eric Katzfey)

@Eric-Katzfey 
It's UgCS.
The default is v1.0.
It's possible to set v2 or auto.
But if I set auto, it fails to connect.
Because it tries to negotiate with v1 at first and VOXL doesn't handle it.

## Reply by Eric Katzfey (ModalAI staff) · 2022-10-24 16:12:54 UTC (in reply to JP Drone)

@JP-Drone Does it work if you set it to v2?

## Reply by JP Drone · 2022-10-25 01:49:02 UTC (in reply to Eric Katzfey)

@Eric-Katzfey Yes, it works.
I am not sure if changing the settings on the GCS side will affect the connection to other copter.
But now it seems fine.
Thanks.