Feature Request Live Heart Rate Data API and BLE Broadcast for CMF Watch Series

Cloaki

To the CMF and Nothing Product Development Team

I am a big fan of the CMF brand and currently use the CMF Watch 3 Pro. While the hardware and design are outstanding, I believe there is a massive untapped potential regarding data accessibility, specifically live heart rate data.

Currently the CMF ecosystem is closed off for realtime data extraction. I would love to suggest implementing a standard interface for this.

Regarding the technical request, please consider adding one of the following two options in a future software update.

Standard BLE Broadcast. This would be an option in the watch settings to broadcast heart rate over standard Bluetooth Low Energy, allowing third party devices or PCs to connect to the watch as a standard heart rate monitor.
Local app API, like WebSockets or REST. This would be an API within the CMF phone app that allows developers to fetch live heart rate data locally via a network stream while the watch is connected.

I want to highlight the value proposition for the streaming community and CMF. I am a streamer myself and fall exactly into the target audience that heavily uses live heart rate integrations like Pulsoid to display our pulse on screen during horror games or competitive games. Right now we are forced to rely on uncomfortable external chest straps.

I would love to dive into my own DIY projects and write custom scripts just to perfectly integrate my CMF Watch into my stream overlay. If the watch supported this data output natively, it would instantly become a highly attractive and comfortable alternative for the entire global streaming community.

While it would be absolutely amazing to have this as a free standard feature for everyone, I completely understand the business side of things. Theoretically you could offer this developer API or live broadcast capability as an optional premium feature within the app or behind a small power user unlock fee. Many users would gladly pay for official and reliable data access.

By implementing this, CMF would bridge the gap between a standard fitness tracker and a powerful tool for the creator economy.

Thank you for your time and for continuing to build great products. I would love to see this idea discussed within your product team.

Best regards

Cloaki (Paul) 😉

Mr Steel

Cloaki As mentioned in the Community Guidelines:

If you’re thinking of creating a post on the nothing.community in the hopes of reaching our software team, this is unfortunately not the most efficient method.

Discussions about our devices and software can be used to validate/confirm bugs are repeatable, but feedback specifically for the team should be submitted as requested below:

For any device that uses Nothing X, you can submit feedback directly via the app itself, simply:

1. Scroll down until you see the ‘About’ tile.
2. In the Support section, press ‘Send feedback’.
3. Choose between ‘Report an issue’ or ‘Improvement suggestion’.

lolifnotely

Cloaki I wish, please do it!

@Mr Steel I assume he also sent feedback and it’s just to encourage the community…

>traSE_

Cloaki

Cloaki I belive you can make a bridge, liken this:

Your phone

Google Fit -> Heath Connect (also google) <– these 2 can auto sync.

And inside Nothing X app you can choose to sync with Health Connect(that live syncs with G-fit.)

Not tested it though, but should work, your end data would end up in Google Fit and summarised there.

“Stuff don’t happen to those who sit down and wait, but to those who stands up and get sh*t done” (The way of the Cmf tribes who got tierd waiting for Nothing 😉)

Cloaki

Mr Steel Thank you for the helpful info! I’ll do that right away.

Cloaki

>traSE_

That’s exactly the point! The issue lies deeper within the watch’s logic:

Sampling Rate: In standard mode, the watch only measures every minute to save battery. For a live stream (especially horror games), this is useless because we need per-second tracking.
Workout Mode Limitation: While the watch does measure every second during a workout (e.g., running), this data is only synced to the app/cloud after the workout has ended. There is no live data flow during the activity.
Practicality: I can’t just run a “fake workout” for a 4-hour stream. The watch would eventually realize I’m not actually moving and pause or cancel the session.

This is why a dedicated “Broadcast Mode” or BLE interface is so essential. We need a feature that forces per-second measurement and “broadcasts” that data immediately via Bluetooth, without the need to record a physical workout. That is the only way to make the watch a viable tool for creators.

Soll ich noch ergänzen, dass andere Hersteller (wie Garmin oder Apple) genau dafür solche speziellen “Herzfrequenz senden”-Modi haben, um das Ganze noch deutlicher zu machen?

>traSE_

Cloaki Ok i understand the problem. Live as down to the second. I don’t think this is a broad issue or on any of those developers “to do-lists”.

I did go outside and played some basketball in the yard, to test it myself,

And it’s abit surprising you can’t run the “specified exercise mode” in the background.(when press home button)

But should be doable, it’s more under the hood of the watch than what we are allowed to use.

I got firmware issue myself, that cant fix myself without risking permanently destroy it. I got cmf watch 2, and you got version 3.. same resolution but diffent display sizes. Makes some watch faces blurry expecially the custom made ones.

My cmf watch 2 has a bold code/font like this 22:30 { hh : mm } , it’s just not enough space so becomes a coordination bug that makes the hour format become blury and melt togheter than being razor sharp as it before. And to fix this if they actually made a copy paste, would make it hard to roll out a specific firmware for watch 2, not hard but not a priority issue, as they focus on new model issues first.