Not aware of a Realpar video that covers this or OPC-UA. I have no experience with Siemens systems. However that said retrieving PLC Data and sending it to a OPC-UA Server is very possible for end analysis of that data or to further sending that data into the Cloud (Azure IoT/AWS). We were able to demo test this as a remote solution at our office with a Allen Bradley CLX Chassis, with an eWON Flexy connected and using FETCH Software to either 1. Auto Retrieve CSV's from the PLC and or 2. Fetch the data from the PLC via the eWON and have it sent to a OPC-UA server connected to the PC. I can tell you it works, works seamlessly once setup and can happen all automatically and build a database of PLC data in the SQL server. Our solution was in remote testing and using an eWON Flexy and FETCH Software to retrieve the data. Microsoft SQL Software also makes it easy to have an easy connection to Azure IoT to also send that SLQ Data into the cloud. This may not answer all your questions, but I'm sure it can help in your end solution.