 The proposed IoT-based system provides guidance to maintenance operators during maintenance procedures, allowing them to safely execute tasks with real-time monitoring of the status of the machines and other personnel. A prototype was developed and tested using a machinery simulator and a real lathe machine, demonstrating the feasibility and usefulness of the system. This article was authored by Teodoro Montanero, Ilaria Surgi, Ilaria Stefinizzi, and others.