Hello, I am working on a IoT platform. I want my Arduino to have a unique identifier to that it can be paired to a certain user in the backend.
How can I get a unique identifier? I thought of using the MAC address, but that's maybe not a good solution.
I heard of burning some serial number in the EEPROM at startup, could that work? Also, I read somewhere that one of the memories has a limited number of writes, is it the EEPROM? When should I used an SD card instead?