code: async def disconnect(self, conn_id):
          
  
          self._ensure_connection(conn_id, True)
  
          dev = self._get_property(conn_id, 'device')
          dev.connected = False
  
          self._teardown_connection(conn_id)
docs: Asynchronously disconnect from a connected device
  
          Args:
              conn_id (int): A unique identifier that will refer to this connection
              callback (callback): A callback that will be called as
                  callback(conn_id, adapter_id, success, failure_reason)