From the QR code printed on the shield case of the BT module,
I think that I can confirm the serial number of the product.
Is there another way to check the serial number?
For example, is it stored in the memory of the BT module and can it be read via UART?
If you have a physical module, the way to get the unit serial number is to scan the QR code. The serial number information is not stored in the memory.