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- Multi-device Notifications: a comparison between MQTT and CoAPPublication . Silva, Luis; Mello, Gabriel de; Silva, Bruno Alves da; Villarrubia Gonzalez, Gabriel; Santana, Juan da Paz; Prata, Paula; Leithardt, ValderiNew devices generate, send, and display messages about their status, data retrieval, and device information. An increase in the number of notifications received, tends to reduce their tolerance . This article sets out a notification management system focused on user profiles and environments. The solution involves transferring notifications in a multi-device scenario using MQTT and CoAP technologies, while also adopting privacy criteria. It consists of three modules, the first of which was prototype and evaluated using real devices.
- PRICHAIN: A Partially Decentralized Implementation of UbiPri Middleware Using BlockchainPublication . Sestrem Ochôa, Iago; Silva, Luis; Mello, Gabriel de; Silva, Bruno Alves da; De Paz, Juan F.; Villarrubia Gonzalez, Gabriel; Garcia, Nuno M.; Leithardt, ValderiWith the popularization of the Internet-of-Things, various applications have emerged to make life easier. These applications generate a large amount of user data. Analyzing the data obtained from these applications, one can infer personal information about each user. Considering this, it is clear that ensuring privacy in this type of application is essential. To guarantee privacy various solutions exist, one of them is UbiPri middleware. This paper presents a decentralized implementation of UbiPri middleware using the Ethereum blockchain. Smart contracts were used in conjunction with a communication gateway and a distributed storage service to ensure users privacy. The results obtained show that the implementation of this work ensures privacy at different levels, data storage security, and performance regarding scalability in the Internet of Things environments.