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Enhanced MQTT for Providing QoS in Internet of Things (IoT): A Study

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Internet of Things (IoT) has been emerged as promising technology. The limited resources of the IoT objects have resulted in restrictions in data transfer. New protocols have been proposed to meet these requirements and restrictions. Message Queue Telemetry Transport (MQTT), Constrain Application Protocol (CoAP) and many other IoT application protocols have been proposed. In this paper, an end-to-end (e2e) Quality of Service (QoS) approach using MQTT for IoT environment is proposed. MQTT provides three levels of QoS for different classes of traffic. However, the traffic flow between subscribers and publishers is not controlled since publishers send data to broker and broker forwards it to subscribers. The absent of reliable end to end flow control can result in an increased number of packet loss and delay. A flow control mechanism is designed to overcome the flow control problem of MQTT where publisher can overwhelm subscriber.
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Keywords: CoAP; Internet of Things; MQTT; QoS Flow Control; e2e

Document Type: Research Article

Affiliations: Network and Communication Technology Lab, Research Center for Software Technology and Management (SOFTAM), Faculty of Information Science and Technology (FTSM), Universiti Kebangsaan Malaysia, 43600 UKM Bangi Selangor, Malaysia

Publication date: July 1, 2018

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