Colmi ring in FitMesh: everything we read today, plus the R09's temperature sensor

If you wear a Colmi ring, FitMesh Sync already reads a lot of what it measures, no manufacturer companion app required. This page covers two separate things: first, what actually works today if you wear a Colmi R-series ring (R02-R10) or an OEM clone sharing the same BLE protocol. Second, what the R09 model does in addition, thanks to a temperature sensor the others don't have — a feature now verified on physical hardware and available in the app.

What FitMesh already reads from your Colmi ring today

FitMesh Sync connects to the ring over direct Bluetooth, no companion app in between. With a Colmi R-series ring (R02-R10) or an OEM clone sharing the same BLE protocol, you get steps, distance, calories, heart rate with a daily log plus resting HR, SpO2, HRV (RMSSD), a stress index, and full sleep with stages (light, deep, REM, awake). Ring battery is always visible in the app. One data point the ring doesn't cover: workouts. Recording workout sessions currently requires a smartwatch or another connected source.

How ring data merges with your smartwatch data

If you also wear a smartwatch, FitMesh Sync doesn't add the two sources together: it applies a source-priority fusion, where the ring is the sleep specialist and wins overnight, while the smartwatch wins during the day for the metrics where it's more accurate. Each metric is counted only once, with the best source available at that moment — no doubled steps, no doubled hours of sleep.

The R09: same protocol, one extra sensor

The Colmi R09 is part of the same R-series (R02-R10) FitMesh supports today — same BLE protocol, same base metrics. The difference is hardware: the R09 (and the related Yawell R05) additionally includes an actual temperature sensor, which the rest of the series doesn't have. Today, that sensor is read by FitMesh too, verified on a physical, worn ring.

Temperature as a wellness signal

The command the R09 uses to expose temperature had never been documented in FitMesh before: we found it by analyzing the ring's BLE protocol, reverse-engineering work informed in part by public research from the open-source Gadgetbridge project on rings with similar hardware. The code to read and interpret that data — in the ring's protocol parser and in the pipeline that merges it with other sources — is written, verified on a physical, worn R09 ring, and our automated tests pass. The recovery index gains a factor tied to temperature deviation from your personal baseline, and the heart health card shows a note when temperature is above your norm.

Why temperature will never be a diagnosis

Just like the ring's SpO2 data today — treated as an informational estimate around possible overnight patterns, not a diagnosis — skin-temperature data is a non-diagnostic wellness signal, not a diagnostic tool. Smart rings, including the R09, are not medical devices and are not certified to diagnose illness or health conditions. A temperature deviation from your personal baseline is one more data point to watch over time, not a clinical verdict. For any real symptoms, an actual doctor's evaluation is what matters.

How we verified R09 temperature

Before including it in a public release, we verified the sensor works on a physical, worn R09 ring — checking that the temperature reading actually populates in the right card and that the recovery index uses it correctly. That verification is done: it's already in the version of FitMesh Sync available today. For details on what's new in the app, check the What's New section.