Bluetooth connection requires explicitly-set hardware ID

[davidmarcelbaum]

Until now, the connection via Bluetooth to the board requires setting the device-specific hardware ID which changes from board to board.

[davidmarcelbaum]

Solved by a dirty workaround of trial-error:

`ports = list(serial.tools.list_ports.comports())

    dummyser                = serial.Serial()
    dummyser.baudrate       = p.baud_rate
    dummyser.timeout        = 1
    dummyser.write_timeout  = 1
    for port in ports:
        if 'UART Bridge' in port.description:
            self.av_ports["USB"] = port.device
            print('Found Helment connected via USB')
            continue
        else:
            # Testing for Bluetooth device
            dummyser.port   = port.device
            print('Searching for Neuri via Bluetooth on ' + port.device)
            dummyser.open()
            try:
                time.sleep(1)
                dummyser.write(bytes(str(int(3)), 'utf-8')) # Force BT state on board
                for _ in range(1000):
                    line = str(dummyser.readline())
                    if '{"c1":' in line and '"c2":' in line:
                        self.av_ports["BT"] = port.device
                        print('Found Helment connected via Bluetooth')
                        break
            except:
                pass
            dummyser.read(dummyser.inWaiting()) # Eliminate message queue at port
            dummyser.close() # Necessary to lierate board`