7.3.4.5 RequestedDeliveryGuarantee

The BrokerTransportQualityOfService values map to MQTT publish and subscribe QoS settings as follows:

AtMostOnce and BestEffort is mapped to MQTT QoS 0.

AtLeastOnce is mapped to MQTT QoS 1.

ExactlyOnce is mapped to MQTT QoS 2.