We won't provide GATT documentation for now because we are currently working on MBED support for MetaWear. This will allow you to write your own firmware and see the code for the GATT services/characteristics. If we provide MBED support it will also come with the documentation you are requesting.
So basically you have to use our API for now.
We did have someone on the forum who reverse engineered the GATT profile of our device; you should talk to him (he wrote drivers for Windows). His username is: ericleigh007
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We did have someone on the forum who reverse engineered the GATT profile of our device; you should talk to him (he wrote drivers for Windows). His username is: ericleigh007