Protocols or formats:

in: K. Rose, S. Eldridge, and L. Chapin, “The internet of Things: An overview,” The Internet Society (ISOC), pp. 80, 2015.
in Pliatsios, A.; Goumopoulos, C.; Kotis, K. A Review on IoT Frameworks Supporting Multi-Level Interoperability – The Semantic Social Network of Things Framework. International Journal on Advances in Internet Technology 2020, 13, 46–64.

Lohiya, R.; Thakkar, A. Application Domains, Evaluation Data Sets, and Research Challenges of IoT: A Systematic Review. IEEE Internet of Things Journal 2021, 8, 8774–8798, doi:10.1109/JIOT.2020.3048439.