Start the &listen long poll and return immediately.

def listen(self, callback=None, timeout=(5, 300)):
        """Start the &listen long poll and return immediately."""
        if self._running:
            return False
        # if self.devices() is False:
        #    return False
        self._queue = Queue()
        self._running = True
        self._timeout = timeout
        self._callback_listen = callback
        threading.Thread(target=self._thread_listen, args=()).start()
        threading.Thread(target=self._thread_worker, args=()).start()
        return True