Rules/Tipps of UUID creation of BLE

Official Hardware Nano Family Nano 33 BLE Sense
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Hi all!

I have question about how to create new UUIDs for the sketch, do we have any rules? I have now from one sample from the internet such Characteristic/Service UUIDs:

BLEService ledService("19B10000-E8F2-537E-4F6C-D104768A1214"); // Bluetooth® Low Energy LED Service
BLEStringCharacteristic ledCharacteristic("19B10001-E8F2-537E-4F6C-D104768A1214", BLEWrite, 10);

The sketch works well, it is not a question of this topic. I don't understand how to generate such UUID for some other characteristics. Another sample has such UUIDs:

BLEService batteryService("180F");
BLEUnsignedCharCharacteristic batteryLevelChar("2A19", BLERead | BLENotify);

It shorter for example. I'm trying to ask which rules we have for creation maybe smth like:

  • amount of letters
  • amount of another characters
  • randomization

For example I can use some randomizer generator and create such strings, or how does it work?

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