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@@ -1,10 +1,23 @@ -# freefit (also known as: FereFit, Lyne_Wearables, HomieFit, zwsvibe, WIRCASS) +# zwzn-freefit-re Reverse-engineering a sketchy Chinese watch app Documentation/protocols derived from decompiled FereFit Android app (jadx) (com.czw.freefit, SHENZHEN ZHONGWEI INTELLIGENT TECHNOLOGY Co.,Ltd) +## What this is and why it exists + +This is a git repo containing protocol documentation of the `freefit` watch app, commonly known as "FereFit", "Lyne_Wearables", "HomieFit", "zwsvibe", and "WIRCASS". It allows us to make our own app implementations for some watches that use these apps. In particular, my testing occurs with the "Watch ULTRA", which I cannot find any more brand information on, though it's a sort of no-name Apple Watch ULTRA knockoff. Although, this protocol should work fine for most other watches that use these apps. + +This exists for many reasons, though here are the top few: + +- I'm 13 and have too much free time +- I wanted to get into reverse-engineering +- I had an old knockoff "Watch ULTRA" from the arcade, and the original app was spyware +- The RTC on this watch drifts badly, so without an app to periodically synchronize it, it becomes almost unusable + +Anyway, talk is cheap, let's get into the documentation! + ## BLE characteristics ### Main characteristics (presumably Nordic UART/Nordic semiconductor chips) |