# voxl-px4 time source

Source: https://forum.modalai.com/topic/5053/voxl-px4-time-source
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2026-02-10 22:07:06 UTC by jon
Replies: 1 · Views: 256

## jon · 2026-02-10 22:07:06 UTC

Do the apps and slpi processors share the same clock? I intend to publish external vio data to voxl-px4, and I'm wondering how it should be timestamped to properly ingest into the EKF2 module. Right now I am timestamping things on the apps side using the monotonic clock (same as voxl-camera-server and voxl-imu-server).

## Reply by Eric Katzfey (ModalAI staff) · 2026-02-10 23:44:53 UTC

@jon For MONOTONIC the apps side uses the slpi version so that they are in sync. Your application should use apps MONOTONIC. PX4 will convert it using timesync.