2.2.2.14 ACK
The ACK message is sent to acknowledge one or more FLOOD (section 2.2.2.11) messages, and to report whether each Record sent in the FLOOD message or messages was useful.
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Message Size |
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Version |
Message Type |
Reserved |
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ACKs Count |
ACKs Offset |
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Record ACK (variable) |
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Message Size (4 bytes): The total number of bytes in the message.
Version (1 byte): The Peer-to-Peer Graphing Protocol version number. This MUST be set to 0x10 to signify version 1.0.
Message Type (1 byte): MUST be set to 0x0E.
Reserved (2 bytes): MUST be set to zero and ignored on receipt.
ACKs Count (2 bytes): The number of Record ACKs in this message.
ACKs Offset (2 bytes): The offset, in bytes, from the beginning of the message to the start of the Record ACK Array.
Record ACK (variable): An array of Record ID/Flag pairs, with each pair in the array formatted as follows.
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0
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91
0
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92
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93
0
1Record ID (16 bytes)
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Reserved
U
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Record ID (16 bytes): The Record ID, expressed as a GUID.
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Reserved (31 bits): MUST be set to zero and MUST be ignored on receipt.
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U (1 bit): When set, indicates that the acknowledged FLOOD for this Record ID was useful. When not set, the FLOOD was not useful.