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2.2.4 CBCP Messages

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There are three types of messages associated with the CBCP -Callback Request (section 2.2.4.1), Callback Response (section 2.2.4.2), and Callback Acknowledgment (section 2.2.4.3). The general format of the CBCP message is specified as follows.


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Code

Identifier

Length

Data (variable)

...

Code (1 byte): This MUST be set to the message type as specified in the following table of values.

Message type

Code

Callback Request

0x01

Callback Response

0x02

Callback Acknowledgment

0x03

Identifier (1 byte): This MUST specify an opaque value that assists in matching the Callback Request message with the corresponding Callback Response and Callback Acknowledgment messages.

Length (2 bytes): This MUST specify the length of the message, including the Code, Identifier, Length, and Data fields.

Data (variable): This MUST specify 0 or more octets of the data specific to the message.