Client Heartbeat Message Fields
See Heartbeats for more information about heartbeats and the session level protocol.
| Field | Offset | Length | Data Type | Description |
|---|---|---|---|---|
| StartOfMessage | 0 | 2 | Binary | Must be 0xBA 0xBA |
| MessageLength | 2 | 2 | Binary | Number of bytes for the message, including this field but not including the two bytes for the StartOfMessage field. |
| MessageType | 4 | 1 | Binary | 0x03 |
| MatchingUnit | 5 | 1 | Binary | Always 0 for inbound (Member to Cboe) messages. |
| SequenceNumber | 6 | 4 | Binary | Always 0 for session level messages. |
| Field Name | Hexadecimal | Notes |
|---|---|---|
| StartOfMessage | BA BA | Start of message bytes. |
| MessageLength | 08 00 | 8 bytes |
| MessageType | 03 | Client Heartbeat |
| MatchingUnit | 00 | Always 0 for inbound messages. |
| SequenceNumber | 00 00 00 00 | Always 0 for session level messages. |