iOS MFI game controller bluetooth protocol

Starting with iOS 7, Apple added official support for game controllers on an iPhone, iPad or iPod touch. Previously, the iCade standard was used, acting as a keyboard device sending key presses for button up and button down.

I have yet to find any place the discusses how these new controllers work. Has anyone reverse engineered it? Does it have digital rights management so you can’t pair using regular devices? Does anyone know?

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