Credit: The Pokémon Company
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，详情可参考新收录的资料
The MAC is in the header because the controller needs to identify the device before decrypting. Encryption keys are per-device, assigned during adoption, so the controller has to know which device is talking before it can look up the right key. Not a security oversight, just a practical requirement. But it means you can route inform traffic without touching the encryption at all.
——“努力创造无愧于时代的新业绩”