Unique Serial numbers and QR code

[djoshi]

Hi

Does all ESP32 module have a unique serial number where we can use to pre register the the device on to our database?

There is a QR code on the device, what is the purpose of that?

I seems this QR code is identical among multiple devices or at least the device I have.

[ESP_Sprite]

The MAC address is guaranteed to be unique; you could use that.

I don't know about a QR code; what device specifically are you talking about?

[djoshi]

QR code on the ESP32 module.

[ESP_Sprite]

Ah, I think that's actually a different type of 2d barcode. According to this, the MAC address is encoded into that (at least on newer modules), and from the random module I grabbed I can confirm the last 12 characters of the string the barcode decodes to is indeed the MAC address.

[djoshi]

I got two modules, which when i use my mobile phone to scan the code are outputting the same results which is
0532042018040028018160004138ESP0V203
0532042018040028018160004138ESP0V203

Does this seems correct?

[ESP_Sprite]

That doesn't look like a code of any module I know of (but then again, I don't generally make it my business to know of every single module, so who knows.) Can you post a picture of the module?

[djoshi]

This is the module

1642884407052.jpg (822.2 KiB) Viewed 10381 times

How do your normally register a device onto a DB prior to a device joining your network or being give to a customer.

[ESP_Sprite]

The Wrover-D is an older module... might be that it's made before they added the MAC to the qr-code.

I would imagine most manufacturers would register the MAC either during the stage where their product is factory-tested and flashed with the actual program, or they don't bother and let the device send the MAC when it's deployed at the customer site and contacts the manufacturers servers.