2.2.22 TRANS_USERDATA_KEEPALIVE
The TRANS_USERDATA_KEEPALIVE packet is used by DXDiag to calculate an RTT. This packet begins with a TRANS_USERDATA_HEADER packet header.
In the packet header, the PACKET_COMMAND_RELIABLE, PACKET_COMMAND_SEQUENTIAL, and PACKET_COMMAND_END_MSG flags MUST be set in the bCommand field. All other bCommand flags are optional. The bControl field MUST be set to PACKET_CONTROL_KEEPALIVE_OR_CORRELATE (0x02) to indicate that the frame is a keep-alive frame (DirectX version 9.0 and later), or that the sender requests a dedicated acknowledgment from the receiver (DirectX 8.0 and earlier). For information about DirectX versions, see section 1.7.
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dwSessID (4 bytes): A 32-bit integer present only in TRANS_USERDATA_KEEPALIVE messages sent to version 0x00010006 recipients. This value MUST be set to the same dwSessID value specified in the TRANS_COMMAND_CONNECT (section 2.2.7) message associated with the connection; otherwise, the packet SHOULD be ignored.