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T. Rausch, S. Nastic, S. Dustdar:
"EMMA: Distributed QoS-Aware MQTT Middleware for Edge Computing Applications";
Talk: IEEE International Conference on Cloud Engineering (IC2E 2018), Orlando, Florida, USA; 2018-04-17 - 2018-04-20; in: "Proceedings of the IEEE International Conference on Cloud Engineering (IC2E 2018)", A. Chandra, J. Li, Y. Cai, T. Guo (ed.); IEEE, (2018), ISBN: 978-1-5386-5009-7; 191 - 197.

Publish-subscribe middleware is a popular technology for facilitating device-to-device communication in large-scale distributed Internet of Things (IoT) scenarios. However, the stringent quality of service (QoS) requirements imposed by many applications cannot be met by cloud-based solutions alone. Edge computing is considered a key enabler for such applications. Client mobility and dynamic resource availability are prominent challenges in edge computing architectures. In this paper, we present EMMA, an edge-enabled publish-subscribe middleware that addresses these challenges. EMMA continuously monitors network QoS and orchestrates a network of MQTT protocol brokers. It transparently migrates MQTT clients to brokers in close proximity to optimize QoS. Experiments in a real-world testbed show that EMMA can significantly reduce end-to-end latencies that incur from network link usage, even in the face of client mobility and unpredictable resource availability.

http://dx.doi.org/10.1109/IC2E.2018.00043