Author Contributions
The authors confirm contribution to the paper as follows: Interoperable IoCT study conception and design based on OGC standards: S.H.L.L. and S.S.; COVID-19 risk assessment: S.S. and J.S.; Contact tracing algorithm and cleaning app S.O. and J.S.; Smart camera sensors: S.H. and M.M.J.; Smart audio sensors: S.K. and S.H.; Data collection, demo visualization, analysis and interpretation of results: S.S.; S.O., S.H., S.K., S.S. took the lead in writing the manuscript. All authors have read and agreed to the published version of the manuscript.