An IoT system that have a Web server from node Red and Grafana for Power Monitoring, the Pump is controlled by the Schneider PLC M221 with a HMI from Weintek MT8071i with Modbus communications on TCP with RTU Gateway from Volison ADM 5850g
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That is great. We also finish a project with SIMATIC IOT2050 reading modbus tcp/ip devices. The data then will be sent to MQTT broker in a VPS. We also write a mobile app for users to monitor the data.
I decided to share my experience with my friends by writing them down. You guys can check it here with google translate 
But if you guys need help, just contact me. For example I write this tutorial on 3 step on configuring IOT2050, IOT2040 for very beginners.