Arquitetura IoT de alta disponibilidade utilizando MQTT-SN e RIOT-OS

Abstract

The study addresses the planning, implementation, validation and testing of a communication architecture for the Internet of Things (IoT) using the MQTT-SN protocol and the real-time operating system RIOT. It proposes creating a tree sensor network with multiple gateways, utilizing the RPL routing protocol to define the best route and the best gateway for a device to send data. In the development of the architecture, the RPL network protocol stack is used for routing and boards with 802.15.4 radio, though radios like LoRa, Bluetooth, and Zigbee can also be used in the RPL network. It discusses the integration of MQTT-SN with RIOT and implements a gateway to translate MQTT-SN messages to MQTT, enabling communication with web-based services. For this architecture, a final client is developed, which has a set of rules for retrying or reconnecting with the gateway based on RPL network metrics. A socket server is also implemented on the edge router for discovering the gateway address, and network configurations and IPv6 routes are set up. To test and validate the architecture, FIT IoT-LAB is utilized, a platform that provides real IoT device infrastructure for testing. As a result, it is observed that the architecture is effective and robust, and the final clients can reconnect to other gateways in case of unavailability in the gateway they are connected to, demonstrating resilience and ensuring high availability.