code: async def connect(self, conn_id, connection_string):
          
  
          id_number = int(connection_string)
          if id_number not in self.devices:
              raise DeviceAdapterError(conn_id, 'connect', 'device not found')
  
          if self._get_conn_id(connection_string) is not None:
              raise DeviceAdapterError(conn_id, 'connect', 'device already connected')
  
          dev = self.devices[id_number]
  
          if dev.connected:
              raise DeviceAdapterError(conn_id, 'connect', 'device already connected')
  
          dev.connected = True
  
          self._setup_connection(conn_id, connection_string)
          self._track_property(conn_id, 'device', dev)
docs: Asynchronously connect to a device
  
          Args:
              conn_id (int): A unique identifer that will refer to this connection
              connection_string (string): A DeviceAdapter specific string that can be used to connect to
                  a device using this DeviceAdapter.
              callback (callable): A function that will be called when the connection attempt finishes as
                  callback(conection_id, adapter_id, success: bool, failure_reason: string or None)