code: def scan_interface(self, address):
          
          if self.cfusb is None:
              try:
                  self.cfusb = CfUsb()
              except Exception as e:
                  logger.warn(
                      'Exception while scanning for Crazyflie USB: {}'.format(
                          str(e)))
                  return []
          else:
              raise Exception('Cannot scan for links while the link is open!')
  
          # FIXME: implements serial number in the Crazyradio driver!
          # serial = "N/A"
  
          found = self.cfusb.scan()
  
          self.cfusb.close()
          self.cfusb = None
  
          return found
docs: Scan interface for Crazyflies