How to get a DevEUI and JoinEUI for a new LoRaWAN device?

Hi everyone:
I know that if I buy a LoRaWAN end device, I will get a DevEUI from the manufacturer. I am curious about that if I am the manufacturer of a lorawan end device, how should I generate a DevEUI for the end device ?
Is there any algorithm that I can use to generate a DevEUI from the device’s Mac command?
What is the relationship among DevEUI, JoinEUI, application key?

use search… lots to be found

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OK, Thank you, what about the first question? Do you know anything about it ?

Has also been extensively discussed on the forum in the past. For instance here and here.

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Got it, Thank you very much!