mqtt-v5.0-csprd02 26 October 2017
Standards Track Work Product Copyright © OASIS Open 2017. All Rights Reserved. Page 5 of 149
3.1.2.9 Password Flag ................................................................................................................................... 33
3.1.2.10 Keep Alive ........................................................................................................................................ 34
3.1.2.11 CONNECT Properties ...................................................................................................................... 35
Property Length ........................................................................................................................ 35
Session Expiry Interval ............................................................................................................. 35
Receive Maximum .................................................................................................................... 36
Maximum Packet Size .............................................................................................................. 37
Topic Alias Maximum ............................................................................................................... 37
Request Response Information ................................................................................................ 38
Request Problem Information ................................................................................................... 38
User Property ........................................................................................................................... 38
Authentication Method.............................................................................................................. 39
Authentication Data ................................................................................................................ 39
3.1.2.12 Variable Header non-normative example ......................................................................................... 39
3.1.3 CONNECT Payload ................................................................................................................... 40
3.1.3.1 Client Identifier (ClientID) ................................................................................................................... 40
3.1.3.2 Will Properties .................................................................................................................................... 41
Property Length .......................................................................................................................... 41
Will Delay Interval ...................................................................................................................... 41
Payload Format Indicator ........................................................................................................... 42
Message Expiry Interval ............................................................................................................. 42
Content Type .............................................................................................................................. 42
Response Topic ......................................................................................................................... 43
Correlation Data ......................................................................................................................... 43
User Property ............................................................................................................................. 43
3.1.3.3 Will Topic ........................................................................................................................................... 43
3.1.3.4 Will Payload ....................................................................................................................................... 43
3.1.3.5 User Name ......................................................................................................................................... 44
3.1.3.6 Password ........................................................................................................................................... 44
3.1.4 CONNECT Actions .................................................................................................................... 44
3.2 CONNACK – Connect acknowledgement ........................................................................................ 45
3.2.1 CONNACK Fixed Header .......................................................................................................... 45
3.2.2 CONNACK Variable Header ..................................................................................................... 46
3.2.2.1 Connect Acknowledge Flags.............................................................................................................. 46
Session Present .............................................................................................................................. 46
3.2.2.2 Connect Reason Code ....................................................................................................................... 47
3.2.2.3 CONNACK Properties ........................................................................................................................ 48
Property Length .......................................................................................................................... 48
Session Expiry Interval ............................................................................................................... 48
Receive Maximum ...................................................................................................................... 48
Maximum QoS ........................................................................................................................... 49
Retain Available ......................................................................................................................... 49
Maximum Packet Size ................................................................................................................ 50
Assigned Client Identifier ........................................................................................................... 50
Topic Alias Maximum ................................................................................................................. 50
Reason String ............................................................................................................................ 51
User Property ........................................................................................................................... 51
Wildcard Subscription Available ............................................................................................... 51
Subscription Identifiers Available ............................................................................................. 51
