How to use the cfclient.utils.input.JoystickReader function in cfclient

def _assist_mode_changed(self, item):
        mode = None

        if (item == 0):  # Altitude hold
            mode = JoystickReader.ASSISTED_CONTROL_ALTHOLD
        if (item == 1):  # Position hold
            mode = JoystickReader.ASSISTED_CONTROL_POSHOLD
        if (item == 2):  # Position hold
            mode = JoystickReader.ASSISTED_CONTROL_HEIGHTHOLD
        if (item == 3):  # Position hold
            mode = JoystickReader.ASSISTED_CONTROL_HOVER

        self.helper.inputDeviceReader.set_assisted_control(mode)
        Config().set("assistedControl", mode)

zmq_params = ZMQParamAccess(self.cf)
        zmq_params.start()

        zmq_leds = ZMQLEDDriver(self.cf)
        zmq_leds.start()

        self.scanner = ScannerThread()
        self.scanner.interfaceFoundSignal.connect(self.foundInterfaces)
        self.scanner.start()

        # Create and start the Input Reader
        self._statusbar_label = QLabel("No input-device found, insert one to"
                                       " fly.")
        self.statusBar().addWidget(self._statusbar_label)

        self.joystickReader = JoystickReader()
        self._active_device = ""
        # self.configGroup = QActionGroup(self._menu_mappings, exclusive=True)

        self._mux_group = QActionGroup(self._menu_inputdevice, exclusive=True)

        # TODO: Need to reload configs
        # ConfigManager().conf_needs_reload.add_callback(self._reload_configs)

        self.connect_input = QShortcut("Ctrl+I", self.connectButton,
                                       self._connect)
        self.cf.connection_failed.add_callback(
            self.connectionFailedSignal.emit)
        self.connectionFailedSignal.connect(self._connection_failed)

        self._input_device_error_signal.connect(
            self._display_input_device_error)

def __init__(self):
        """Initialize the headless client and libraries"""
        cflib.crtp.init_drivers()

        self._jr = JoystickReader(do_device_discovery=False)

        self._cf = Crazyflie(ro_cache=None,
                             rw_cache=cfclient.config_path + "/cache")

        signal.signal(signal.SIGINT, signal.SIG_DFL)

        self._devs = []

        for d in self._jr.available_devices():
            self._devs.append(d.name)

def _assist_mode_changed(self, item):
        mode = None

        if (item == 0):  # Altitude hold
            mode = JoystickReader.ASSISTED_CONTROL_ALTHOLD
        if (item == 1):  # Position hold
            mode = JoystickReader.ASSISTED_CONTROL_POSHOLD
        if (item == 2):  # Position hold
            mode = JoystickReader.ASSISTED_CONTROL_HEIGHTHOLD
        if (item == 3):  # Position hold
            mode = JoystickReader.ASSISTED_CONTROL_HOVER

        self.helper.inputDeviceReader.set_assisted_control(mode)
        Config().set("assistedControl", mode)

zmq_params = ZMQParamAccess(self.cf)
        zmq_params.start()

        zmq_leds = ZMQLEDDriver(self.cf)
        zmq_leds.start()

        self.scanner = ScannerThread()
        self.scanner.interfaceFoundSignal.connect(self.foundInterfaces)
        self.scanner.start()

        # Create and start the Input Reader
        self._statusbar_label = QLabel("No input-device found, insert one to"
                                       " fly.")
        self.statusBar().addWidget(self._statusbar_label)

        self.joystickReader = JoystickReader()
        self._active_device = ""
        # self.configGroup = QActionGroup(self._menu_mappings, exclusive=True)

        self._mux_group = QActionGroup(self._menu_inputdevice, exclusive=True)

        # TODO: Need to reload configs
        # ConfigManager().conf_needs_reload.add_callback(self._reload_configs)

        self.cf.connection_failed.add_callback(
            self.connectionFailedSignal.emit)
        self.connectionFailedSignal.connect(self._connection_failed)

        self._input_device_error_signal.connect(
            self._display_input_device_error)
        self.joystickReader.device_error.add_callback(
            self._input_device_error_signal.emit)