The system consists of small battery-powered devices that are mounted to the manholes or any other infrastructure that can be opened or closed with a limit switch. Each opening and closing of the is noted by sensors located in the gateway. These, via standardized communication protocols (NB-IoT or LTE Cat. M1) send an event signal to the IoT platform (Comarch IoT Platform or other). Then, data are received, processed and analyzed. On this basis, the platform can send alerts to the customer and generate reports. Importantly, it can also be integrated with other Comarch or external IT systems (such as Comarch FSM, which is used to manage the work of field employees).