Comparison with Assured Transfer of Information Mechanisms in MQTT

Various protocols for IoT services are widely discussed currently. One of these protocols is message queuing telemetry transport (MQTT), which is an approach based on the information centric network (ICN) technology. However, MQTT must be operated over IP and its related protocols; therefore, the co-operation between MQTT and these protocols is an interesting topic of study. One of the issues related to the abovementioned study is the mechanism to transfer information assuredly. MQTT provides some mechanisms for the assured transfer of information such as “Quality of Service (QoS) classes” with several options such as QoSO, QoSl, and QoS2. TCP also provides a re-transmission scheme for this purpose. This study surveys the mechanism based on MQTT QoS classes, and discusses transmission performance with comparisons among TCP based and MQTT QoS class-based approaches. It concludes that the QoSl in MQTT can be invoked to perform an assured transfer of information with small delay.