Hello,
I have built a smart-metering solution having Raspberry Pi as a remote data collection microcontroller.
We are selling it in regular manner, but we also are creating a customized solutions based on already implemented parts of code. We can handle DLMC, IEC1106, MBus, ModBus and many other protocols used by different meters.
I can prepare you a showcase like you mention with given budget. But honestly if you want to have a real industry-grade solution. If you are interested in cooperation, please send me more details what do you want finally - the simple simulation only, or is it a proof-of-concept for larger project?
Best regards,
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Lucas izbaner