code: def _open_tracing_interface(self, conn_id, callback):
          
  
          try:
              handle = self._find_handle(conn_id)
              services = self._connections[handle]['services']
          except (ValueError, KeyError):
              callback(conn_id, self.id, False, 'Connection closed unexpectedly before we could open the streaming interface')
              return
  
          self._command_task.async_command(['_enable_tracing', handle, services],
                                           self._on_interface_finished, {'connection_id': conn_id, 'callback': callback})
docs: Enable the debug tracing interface for this IOTile device
  
          Args:
              conn_id (int): the unique identifier for the connection
              callback (callback): Callback to be called when this command finishes
                  callback(conn_id, adapter_id, success, failure_reason)