Callback when connection initial connection fails (i.e no Crazyflie
        at the specified address)

def _connection_failed(self, link_uri, msg):
        """Callback when connection initial connection fails (i.e no Crazyflie
        at the specified address)"""
        print('Connection to %s failed: %s' % (link_uri, msg))
        self._is_link_open = False
        self._error_message = msg
        self._connect_event.set()