An MQTT-SN-Based QoS Dynamic Adaptation Method for Wireless Sensor Networks

Abstract

The Internet of Things (IoT) is a concept that has disseminated in the last few years. The idea is to connect smart devices through a network solution. IoT will be present in everyday objects and in people’s lives. The economic impact of IoT solutions is expected to be, annually, billions of dollars. To provide data exchange from smart devices, some protocols are being used. The Message Queuing Telemetry Transport Protocol (MQTT) is one of the most common application protocols for IoT and Machine-to-Machine (M2M) communications. The MQTT uses the publish/subscribe paradigm, which provides three Quality of Service (QoS) to ensure communication between the smart devices. There is a version of MQTT for Sensor Network (SN), named of MQTT-SN, developed especially for messages exchanging in Wireless Sensors Networks (WSNs). As many smart devices can be connected in the same network, it can result in network overload and message loss. To ensure a better message delivery, a QoS Dynamic Adaptation Method (DAM) for WSNs was developed. The DAM is focused on selecting the proper QoS level, based on network latency conditions. The proposed method showed good performance when compared with the normal QoS strategy implemented in the MQTT-SN protocol.