With the shutdown of the 2G mobile network, the classic SMS butler became obsolete. Many applications in building technology and industry were affected. Of course we could have simply replaced the integrated 2G modem with a 4G variant. But who wants to bring a 20-year-old technology into new products? Definitely not CoRe. Today, our resulting IoT solution is used in thousands of applications in the field. That in itself is a pleasure. What is more pleasing is the fact that each installed device could be expanded with further functions in the meantime. The integrated OTA technology guarantees added value in the field. Be it the event log, the possibility of a voice call in the event of an event or the control of telepagers from PSAs. There is no need to be on site for any of these updates. Everything is easily accessible from the workplace via the IoT Cloud.