HID Assistive Switch Control??

In the world of Accessibility / Apple there are two ways of implementing a switch for access: Use a HID Keyboard - or Apple's Own HID Assistive Switch control. I can't find any documentation as to what this is - Does anyone have any details on how to listen for these types of devices (The only one I can find is this: https://www.ablenetinc.com/downloads/dl/file/id/663/product/515/hook_product_info.pdf )

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Apple's Own HID Assistive Switch control … I can't find any documentation as to what this is

I believe you’re referring to a type of device that’s built under the aegis of MFi. The technical details of MFi are not public, which explains why you can’t find any info. If you want to build such a device, you’ll need to join the MFi developer programme.

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