The IoT lives on the one hand from the intelligent “things”, but just as much from the overarching networking of things. This is done by the cloud and IoT platforms. Most of these platforms have the IoT protocol MQTT as one of their primary interfaces. The data on the digital twins of things are exchanged with the real things via MQTT. The OPC Router can serve as a communication partner for these platforms with its MQTT Client Plug-in and thus send data from the real world to the platform, but the path from the cloud back to the “real things” is also possible. What can be considered a “thing” from the OPC Router point of view results from the Plug-ins of the OPC Router. By combining each of its Plug-ins with the MQTT Client Plug-in, printers, SQL servers, SAP systems, etc. can be integrated into the respective IoT platform. Common IoT platforms are, for example, Amazon AWS IoT (instructions for the AWS IoT Cloud connection with MQTT), Microsoft Azure (instructions for the connection of Azure IoT Hub with MQTT), IBM Watson, ThingWorx.