Hi George I have no idea if this is document, I'll answer based on observations. On Oct 17, 2012, at 5:08 PM, George Chung wrote:

Dear all,

I don't find any details about Bluetooth HID in iOS document.

1. How many of keys does iOS support for Bluetooth HID keyboard? An iOS app can only receive single key enter events using the official APIs.

2. How does the app know there is an Bluetooth HID keyboard? There's a way to receive a notification when the on-screen keyboard gets shown, e.g. to move fields above the keyboard. See e.g. Erica Sadun's iOS Cookbook.

3. Does iOS support Bluetooth HID gamepad? How many key supports? How does an app know the availability of the Bluetooth gamepad? iOS supports e.g. the iCade device. To work around the limitations of the single key event, the iCade sends different keys for button up / down. So pressing the left arrow might send Q and releasing it might send A. With that, many buttons are supported.

Cheers Matthias

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