D. Hästbacka, M. Tran, P. Kannisto, M. Filppula, and P. Varga, "External Token-based Authorization of Data-driven Integrations and Service Compositions in MQTT 5", in 49th Annual Conference of the IEEE Industrial Electronics Society (IECON), 2023, pp. 1-6. doi:10.1109/IECON51785.2023.10311779