My automatic meter reading project

I don’t think Glyn has the time available to research and design a customised solution for you nor anyone else. If you post your question, anyone with knowledge or suggestions can help you.

If your project is so secret that it is commercially sensitive (e.g. you think you can patent it), then you should approach a commercial design consultant who will work with you under a non-disclosure agreement. We cannot do that because it is against the principles of open-source.