The protocol version is present in the variable header of a CONNECT message.
The field is an 8-bit unsigned value that represents the revision level of the protocol used by the client. The value of the Protocol version field for the current version of the protocol, 3 (0x03), is shown in the table below.
bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
---|---|---|---|---|---|---|---|---|
Protocol Version | ||||||||
0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
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