Avaliação da funcionalidade de assinaturas compartilhadas no MQTT V5.0

Abstract

The number of devices connected to the internet grows continuously and rapidly forming the Internet of Things (IoT). Given that all these devices communicate with each other and with other services, the concern to ensure a fault-tolerant, secure and optimized system comes up. For this communication to happen, machine-to-machine (M2M) protocols are used, in which MQTT (Message Queuing Telemetry Transport) stands out. MQTT is a client server message transport protocol that works on the publish/subscribe model and runs over the TCP/IP network. Furthermore, the protocol is light weight, open, simple and designed so as to be easy to implement. Therefore, MQTT is, due to its characteristics, it is the most used and widespread protocol in IoT and M2M communications. In 2019, version 5.0 was released accompanied by several features, including shared subscriptions. This functionality promises to balance the load between subscribers of certain topic, however, as it is a recent functionality, little of its potential has yet been explored. Therefore, the present work proposes an evaluation of the behavioral and performance aspects of MQTT v5.0 with a focus on the functionality of shared subcriptions.