BAP Packet Fields
Type  A one-octet field coded in binary and hexadecimal that identifies the type of BAP datagram packet. See Datagram Types
Identifier  A one-octet field, in binary code, that aids in matching requests and indications with responses. 
Length  A two-octet field, in binary code, that indicates the length of the packet in bytes and the packet type. 

Note - Octets outside of the range of the length field should be ignored. 

Data  A data field that is variable in length and usually contains a list of zero or more BAP options that the sender is trying to transmit. 
Response Code  Only present in Response datagrams, an eight-octet field, in binary code, that indicates the request or indication command is valid and was successfully received. See Response Code Values