Implementation and Evaluation of the Control Mechanism Among Distributed MQTT Brokers

MQTT for IoT communication requires multiple brokers to aggregate traffic from localized areas. However, routing mechanisms among these brokers have yet to be specified. In this paper, the Distributed MQTT broker by data Link look-up for Traffic reduction (DMLT) is proposed as a new routing mechanism. This mechanism is aimed at layer-2 based control. It provides cooperation with MQTT and the Spanning Tree Protocol and invokes a traffic reduction and simplified transfer by an independent flow. We evaluate the performance of the DMLT method and compare the DMLT method and the conventional method in terms of traffic volume. According to the experimental results, a reduction in traffic volume is confirmed. We also build and verify a prototype of a wide-area DMLT (WDMLT) system, which is a method suitable for large-scale deployment of DMLT. Finally, the IoT DEP registered as an international standardization and its application to the proposed method is explained.