BLEDeviceConnection.kt

//Our connection to the selected device
private var gatt: BluetoothGatt? = null

//Whatever we do with our Bluetooth device connection, whether now or later, we will get the
//results in this callback object, which can become massive.
private val callback = object: BluetoothGattCallback() {
    //We will override more methods here as we add functionality.
    
    override fun onConnectionStateChange(gatt: BluetoothGatt, status: Int, newState: Int) {
        super.onConnectionStateChange(gatt, status, newState)
        //This tells us when we're connected or disconnected from the peripheral.
        
        if (status != BluetoothGatt.GATT_SUCCESS) {
            //TODO: handle error
            return
        }

        if (newState == BluetoothGatt.STATE_CONNECTED) {
            //TODO: handle the fact that we've just connected
        }
    }
}

@RequiresPermission(PERMISSION_BLUETOOTH_CONNECT)
fun connect() {
    gatt = bluetoothDevice.connectGatt(context, false, callback)
}