Adapting joycontrol's usage of bluez to macOS IOBluetooth with support from https://github.com/PureSwift/BluetoothDarwin for lower-level API access.

1. Run from Xcode
2. Toggle Allow pairing on
3. Ensure Switch is at Controllers -> Change Grip/Order screen
4. After a successful connection at the Change Grip/Order screen, click Connect in the UI to establish a permanent connection with the Nintendo Switch

If the Switch stops attempting to connect in the Change Grip/Order screen, try:

• Resetting the bluetooth service in macOS:

sudo launchctl stop com.apple.bluetoothd && launchctl start com.apple.bluetoothd

• OR: Putting the Switch to sleep and waking it up again

• UPDATE: This appears to only happen on the Change Grip/Order screen. Once the initial connection is made there, exit the menu and then click Connect in the UI. Bluetooth controller appears to initiate a disconnect after everything is running smoothly. It's still unclear why the following happens (log captured with Packet Logger from Xcode Tools):

Feb 09 15:30:38.153
Note
0x0000
Attempt to close L2CAP Channel 0x0042 for connection handle 0x0020 from process "Unknown (0) (IOBluetoothDeviceUserClient::closeConnectionWL())"

• Extract joycontrol-specific logic into a Swift package
• UPDATE: Made this permanent. Won't be supporting L & R JoyCons Only Pro Controller is emulated at the moment
• UPDATE: This doesn't appear to cause any significant issues at present. Input Report frequency is limited at the moment
• Add control stick support to UI