code: def visible_devices(self):
          
  
          devs = {}
  
          for device_id, adapters in self._devices.items():
              dev = None
              max_signal = None
              best_adapter = None
  
              for adapter_id, devinfo in adapters.items():
                  connstring = "adapter/{0}/{1}".format(adapter_id, devinfo['connection_string'])
                  if dev is None:
                      dev = copy.deepcopy(devinfo)
                      del dev['connection_string']
  
                  if 'adapters' not in dev:
                      dev['adapters'] = []
                      best_adapter = adapter_id
  
                  dev['adapters'].append((adapter_id, devinfo['signal_strength'], connstring))
  
                  if max_signal is None:
                      max_signal = devinfo['signal_strength']
                  elif devinfo['signal_strength'] > max_signal:
                      max_signal = devinfo['signal_strength']
                      best_adapter = adapter_id
  
              # If device has been seen in no adapters, it will get expired
              # don't return it
              if dev is None:
                  continue
  
              dev['connection_string'] = "device/%x" % dev['uuid']
              dev['adapters'] = sorted(dev['adapters'], key=lambda x: x[1], reverse=True)
              dev['best_adapter'] = best_adapter
              dev['signal_strength'] = max_signal
  
              devs[device_id] = dev
  
          return devs
docs: Unify all visible devices across all connected adapters
  
          Returns:
              dict: A dictionary mapping UUIDs to device information dictionaries