2.2.2.7 ACK

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The ACK message is sent from one node to another to acknowledge receipt of a REQUEST or FLOOD message.


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FieldID1

Length1

Acked MessageID

FieldID2 (optional)

Length2 (optional)

Reserved (optional)

N

(optional)

FieldID1 (2 bytes): MUST be set to 0x0018 (DRT_HEADER_ACKED).

Length1 (2 bytes): MUST be set to 0x0008.

Acked MessageID (4 bytes): The value of the MessageID field in the DRT Header of the message to which this is a response.

FieldID2 (2 bytes): MUST be present if and only if the N flag is set. If present, this field MUST be set to 0x0040 (FLAGS_FIELD).

Length2 (2 bytes): MUST be present if and only if FieldID2 is present. If present, this field MUST be set to 0x0006.

Reserved (15 bits): MUST be present if and only if the N flag is set. If present, this field MUST be set to zero and ignored on receipt.

N (1 bit): Not Found. MUST be present in response to a FLOOD message if and only if there is no key registered on the sender that corresponds to the Validate Key field in the FLOOD message to which this ACK message is a response.