Summary
International Technical Conference on Circuits/Systems, Computers and Communications
2016
Session Number:T2-4
Session:
Number:4843
Adaptive Publish Time and QoS Level over MQTT Protocol
Nuttakit Vatcharatiansakul, Panwit Tuwanut ,
pp.539-542
Publication Date:2016/7/10
Online ISSN:2188-5079
Summary:
Several application protocols have been proposed for Internet of Things (IoT) solutions, but the most widely used are the Message Queuing Telemetry Transport (MQTT) and the Constrained Application Protocol (CoAP). To ensure that the messages are transmitted accurately and reliability, both MQTT and CoAP support Quality of Service (QoS). There are three QoS levels in MQTT and four levels in CoAP. However, the characteristic of a medium such as signal attenuation, propagation delays, bit error rates and others affect to this transmission. In this paper, we proposed that QoS level should be adaptively adjusted according to the consideration of link conditions. Moreover, the periodic period times to publish/post message also adaptively adjust. Based on experimental results show that the proposed scheme can ensure message reliability.