structure.txt

Control Packet Structure:
    1. Fixed header - slice of bytes
    2. Variable header - 2 bytes
    3. Payload -

Control Packets by client | Methods
    1.  Connect     | Connect
    2.  Publish     | Publish
    3.  PubAck      | AcknowledgedPublish
    4.  PubRec      | ReceivedPublish
    5.  PubRel      | ReleasePublish
    6.  PubComp     | CompletedPublish
    7.  Subscribe   | Subscribe
    8.  Unsubscribe | Unsubscribe
    9.  PingReq     | Ping
    10. Disconnect  | Disconnect

CONNECT Packet:
    Fixed Header:
                _________
        Byte-1: 0001|0000|
        Byte-2: Remaining Length(len(Variable Header)+len(payload))
    
    Variable Header: -> 10 bytes
        Protocol Name - 6 bytes
        Protocol Length - 1 byte
        Connect Flags - 1 byte
        Keep-Alive - 2 bytes
        Connect Flags:
            0 -  Reserved
            1 - Clean Session
            2 - Will Flag
            3
            4 - Will Qos
            5 - Will Retain
            6 - Password 
            7 - Username
    Payload:
        ClientId 1-23 bytes
        Will Topic
        Will Message
        Username
        Password