pcom_serial.py 文件源码

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

        # The data in the response message will be a list,
        # the property name should be in the 0th position
        # and strip the NULL byte.
        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)