# voxl-slpi-uart-bridge

Source: https://forum.modalai.com/topic/5239/voxl-slpi-uart-bridge
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2026-06-03 20:24:21 UTC by jon
Replies: 1 · Views: 147

## jon · 2026-06-03 20:24:21 UTC

Hi, I am looking at the voxl-slpi-uart-bridge https://gitlab.com/voxl-public/voxl-sdk/core-libs/voxl-slpi-uart-bridge repo. Would this be capable of making one of the J19 uarts available to the apps processor for external sensor connection (not running voxl-px4)? 

Specifically using voxl2 mini

I also have some questions about how to use it. Is it an executable you run that creates a virtual uart interface? Or a library that you reference in code. If so, is there a short implementation example anywhere?

Thank you!

## Reply by Eric Katzfey (ModalAI staff) · 2026-06-04 16:26:05 UTC

@jon You can use a J19 UART from the apps processor. Take a look at the code in voxl-elrs (https://gitlab.com/voxl-public/voxl-sdk/utilities/voxl-elrs/-/tree/dev?ref_type=heads), specifically the file `src/elrs_slpi.c`. This project accesses SLPI UARTs from an AP userspace process through voxl_io, not through POSIX termios. You cannot have a flight controller running at the same time though so PX4 / ArduPilot / etc. would need to be stopped first.