Thank you for the replies. I think Bluetooth Mesh is more on less what I have in mind but hadn't read anything about it. I'd do some reading of what tdb linked above and see what can be done. Indeed the 'version' issue can be tricky, but you are right, there is a solution to be found for every problem. Thanks again and I may bother you again soon with a question or two :)
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Thank you for the replies. I think Bluetooth Mesh is more on less what I have in mind but hadn't read anything about it. I'd do some reading of what tdb linked above and see what can be done. Indeed the 'version' issue can be tricky, but you are right, there is a solution to be found for every problem. Thanks again and I may bother you again soon with a question or two :)