Each message in the packet starts with a Binary message header that consists of the Binary Size and SBE header (Length, TemplateID, SchemaID, and Version).
| Name | Type | Description |
|---|---|---|
| MsgSize | uInt16 | Length of entire message, including binary header in number of bytes |
| Simple Binary Encoding Header | ||
| BlockLength | uInt16 | Length of the root of the FIX message contained before repeating groups or variable/conditions fields |
| TemplateID | uInt16 | Template ID used to encode the message |
| SchemaID | uInt16 | ID of the system publishing the message |
| Version | uInt16 | Schema version |