Ble gamepad

[hathach]

This PR based on and supersede #622 to add BLEHidGamepad support as separated class from BLEHidAdafruit and blehid_gamepad example. which is inspired by @nekuneko exellent PR support for gamepad for both usb and ble.

example is tested on android and windows. Unfortunately I don't know how to test it on iOS/iPad, maybe Apple require an MFi licence or something. If anyone know how to test this out, please let me know.

Huge thanks to @nekuneko for series of gamepad PR for usb and ble that help to implement this.

Note: also take chance to rename example from hid to blehid (to distinguish from usb hid). Also tweaking existing example. close #622 , fix #228, fix #36

[ThomasAtBBTF]

Will there also be an CircuitPython equivalent? And a sample? I would be very interested in that.

[EtienneGameSeed]

Hello, I've tried the BLE GamePad example on an NRF52840 Feather Express and on 2 different Windows 10 portable PCs with integrated Bluetooth. On both PCs is behaves the same way:

• I add a bluetooth device, the PC sees the feather, I can click on the device to connect to it.
• I can pair the device, the game pad is correctly recognised and works as it should. The devices appears as "Connected".
• when I unplugg the Feather's power, the devices is still present on the PC, and is marked as "Paired", but the game controller is removed. This is the normal behaviour I suppose.
• when I power on the Feather again, the pairing is done, then on the PC it shows "Connected" for a short amount of time, and then disconnects. Then pairing starts again, it connects, and then disconnects again, this cycle occurs forever.
• To make it work again, I have to delete the device on the PC, and add it again.

I have tried with an ESP 32 and the ESP32 BLE gamepad library, and it works (no need to delete the device when power off/on), so the problem is not comming from the PCs Bluetooth stacks.