HID Gamepad Client & Central HID Gamepad example

[OstlerDev]

Hello! I have been working on a personal project recently and came across some missing functionality inside of the library. There was no way to connect as a Central role to an HID Gamepad peripheral. I went ahead and implemented it myself closely mirroring the Keyboard support.

This work is related to and extends upon the following old issues and pull requests.

• https://github.com/adafruit/Adafruit_nRF52_Arduino/issues/228
• https://github.com/adafruit/Adafruit_nRF52_Arduino/pull/622
• https://github.com/adafruit/Adafruit_nRF52_Arduino/pull/688

The testing process I took is as follows:

1. Upload the (newly updated) example at examples/Central/central_hid/central_hid.ino to an Adafruit Feather NRF52840 Express board
2. Upload the example at examples/Peripheral/blehid_gamepad/blehid_gamepad.ino to an Adafruit Feather NRF52840 Express board
3. View each's Serial Console to verify:
   • They both fully pair to each other
   • The Central feather is able to receive gamepad reports from the Periph feather
   • Both polling and callback functionality works from the Central role

I am fairly confident it should be ready to be merged in, however I would greatly appreciate feedback on what to change.

Changelog

Added

• Example for connecting to BLE Gamepads from a Central role
• Support for HID Gamepad Clients in BLEClientHidAdafruit

  Changed

• Allow for up to 8 BLE Characteristics inside of BLEDiscovery (This is likely something that will need discussion and feedback on it)
• Add Debug logging to log UUID of all BLE Characteristics for a service inside of BLEDiscovery

[willwade]

+1 for merging this! It looks great

[someburner]

bump- I see no reason to not merge this, works fine!

[OstlerDev]

It would be great to see this merged in! 😸

[hathach]

sorry for late response, I am wrapping other works and will review this as soon as I could. Thank you for your patient.