2.2.1.2 Common Message Header

A common message header MUST be present in every message after a qWave-WD session has been established. Each message header contains a common header optionally followed by a message-specific header.

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Message_Size																Message_ID
Reserved																Reserved_2
Message_Specific_Header (variable)
...

Message_Size (2 bytes): A 16-bit unsigned integer that specifies the size of the message. This value includes the size of this header and the payload that follows.

Message_ID (2 bytes):  A 16-bit unsigned integer that specifies the type of message, which defines the form of the payload that follows. The value of this field MUST be one of the following.

Value	Meaning
0x0009	Connect Message (section 2.2.2.1)
0x000A	Connect Response Message (section 2.2.2.2)
0x000B	Collect Data Message (section 2.2.2.3)
0x000C	Collect Data Response Message (section 2.2.2.4)
0x000D	Force BSS List Scan Message (section 2.2.2.5)
0x000E	Force BSS List Scan Response Message (section 2.2.2.6)
0x000F	Get BSS List Message (section 2.2.2.7)
0x0010	Get BSS List Response Message (section 2.2.2.8)

Reserved (2 bytes): A value that MUST be zero and ignored on receipt.

Reserved_2 (2 bytes): A value that MUST be zero and ignored on receipt.

Message_Specific_Header (variable): An optional message-specific header that corresponds to the message type identified in the Message_ID field. The formats for message-specific headers for all message types are defined in Message-Specific Syntax (section 2.2.2).