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For MDP 3.0 messaging, 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)

NameBinary Type (Size)Number of BytesReqDescription
MsgSize

uInt16

2

Y

Length of entire message, including binary header in number of bytes

Simple Binary Encoding Header
BlockLength

uInt16

2

Y

Length of the root of the FIX message contained before repeating groups or variable/conditions fields

TemplateID

uInt16

2

Y

Template ID used to encode the message

SchemaIDuInt162YID of the system publishing the message
Version

uInt16

2

Y

Schema version

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