Internet of Things. Technology and Applications 4th IFIP International Cross-Domain Conference, IFIPIoT 2021, Virtual Event, November 4–5, 2021, Revised Selected Papers - Camarinha-Matos, Luis M.; Heijenk, Geert; Katkoori, Srinivas; Strous, Leon (IFIP Advances in Information and Communication Technology, 2022)