This object chooses whether the encryption key for this radio link is manually entered by an admin or automatically generated and rotated by the system, with automatic generation only available if the agent supports it. An admin managing many links might prefer automaticKeyGeneration(2) to reduce manual key handling, while manuallyEnteredKey(1) gives full control over a specific pre-shared key. The default value is manualEnteredKey(1), requiring the admin to populate rdEncryptKey directly.