Connect the link driver to a specified URI of the format:
        radio://<dongle nbr>/<radio channel>/[250K,1M,2M]

        The callback for linkQuality can be called at any moment from the
        driver to report back the link quality in percentage. The
        callback from linkError will be called when a error occues with
        an error message.

def connect(self, uri, link_quality_callback, link_error_callback):
        """
        Connect the link driver to a specified URI of the format:
        radio://<dongle nbr>/<radio channel>/[250K,1M,2M]

        The callback for linkQuality can be called at any moment from the
        driver to report back the link quality in percentage. The
        callback from linkError will be called when a error occues with
        an error message.
        """

        # check if the URI is a radio URI
        if not re.search('^usb://', uri):
            raise WrongUriType('Not a radio URI')

        # Open the USB dongle
        if not re.search('^usb://([0-9]+)$',
                         uri):
            raise WrongUriType('Wrong radio URI format!')

        uri_data = re.search('^usb://([0-9]+)$',
                             uri)

        self.uri = uri

        if self.cfusb is None:
            self.cfusb = CfUsb(devid=int(uri_data.group(1)))
            if self.cfusb.dev:
                self.cfusb.set_crtp_to_usb(True)
            else:
                self.cfusb = None
                raise Exception('Could not open {}'.format(self.uri))

        else:
            raise Exception('Link already open!')

        # Prepare the inter-thread communication queue
        self.in_queue = queue.Queue()
        # Limited size out queue to avoid "ReadBack" effect
        self.out_queue = queue.Queue(50)

        # Launch the comm thread
        self._thread = _UsbReceiveThread(self.cfusb, self.in_queue,
                                         link_quality_callback,
                                         link_error_callback)
        self._thread.start()

        self.link_error_callback = link_error_callback