pcom_serial.py 文件源码

def get_command_name(self, to, requested_command_id):
        """
        Sends a messge down the serial line requesting the property name of a given property ID,
        used in discovery protocol
        :param to: destination ID
        :param requested_command_id: command ID that we want to know the name of
        :return: name from Embedded Core
        """
        try:
            response = yield self.send_command(to, command_id=GET_COMMAND_NAME, params=["command_id"],
                                               data=[requested_command_id])
        except Exception as e:
            logger.error("[PCOM] Unable to find command name for command {0} in item {1} because of exception:"
                         "{2}".format(requested_command_id, to, e))
            defer.returnValue(None)

        # The data in the response message will be a list,
        # the command name should be in the 0th position
        try:
            defer.returnValue(response.data[0])
        except IndexError:
            logger.error("Response from embedded board during discovery sequence did not return data in expect format."
                         " Expected at least one data field, received: {0}".format(response.data))
            defer.returnValue(None)