A central server for communicating with a user equipment and a cellular network is provided. The server is configured to exchange with the cellular network information relating to at least one preconfigured qualifier assigned to the user equipment and assigned to the central server. The server receives a payload item from the cellular network transmitted by the user equipment to said cellular network by means of an authentication failure message for authenticating a user equipment at a cellular network during an attach comprising the payload item, instead of receiving a SMS or establishing an IP connection with the user equipment. The payload item can result from a latest measurement data of user equipment regularly transmitting data to said central server and/or a sensor connectively coupled to the user equipment when operating as an Internet of Things (IoT) smart-metering device.