---
title: SDK Lite HFR
slug: ncam-reality/sdk-lite-hfr
createdAt: 2021-08-29T22:37:41.000Z
---

### What is this

**SDK Lite** has been upgraded in **2022.0** in order to provide users who need it with a **low-latency**, **high-frame rate** mode (**HFR**).

**HFR** relies on updates from the **IMU** to set the position of the camera **as soon as possible**. It is more prone to extrapolation inaccuracies, but those should be very small.

By doing so, we are able to reach framerates well beyond the capabilities of our feature trackers which are limited by the camera bar sensor refresh rates. Typically around **300 frames per second**.

::Image[]{src="https://api.archbee.com/api/optimize/Qn0sdcVrDcDbwMFmH0oYn/soAScVQKE6uaaDAcCtqYc_hfr.png" size="76" width="824" height="334" caption="HFR in action" position="center" showCaption="true"}

To activate it, please head over to **Preferences**, **Datastream Tab** and check **SDK Lite HFR** on.

::Image[]{src="https://api.archbee.com/api/optimize/Qn0sdcVrDcDbwMFmH0oYn/yIzNY3ZHDzuU0u06xW4iQ_hfrpref.png" size="76" width="1026" height="982" caption="HFR mode in preferences" position="center" showCaption="true"}

### Data Stream - UDP Only

In it's current implementation, the HFR protocol can **only** be streamed via UDP. Serial implementation is not available as the required bandwidth is not achievable

The UDP data stream can be configured to either **broadcast** or **unicast** and the destination IP and port are fully configurable via the Ncam Reality Full UI preferences. By default, SDK lite HFR packets will be sent on port **3006**.