[OASIS Issue Tracker] (MQTT-432) Consider adding return code of "Authentication failed"

[ https://issues.oasis-open.org/browse/MQTT-432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=66313#comment-66313 ] 

Richard Coppen commented on MQTT-432:
-------------------------------------

Reviewed with editors.

Take to TC

> Consider adding return code of "Authentication failed"
> ------------------------------------------------------
>
>                 Key: MQTT-432
>                 URL: https://issues.oasis-open.org/browse/MQTT-432
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 5, wd13
>            Reporter: Richard Coppen
>
> There is no return code on CONNACK and DISCONNECT for  "Authentication Failed". The general guidance is to use "Not Authorised". This seems a little confusing as the Client can't be authorised as it's not yet authenticated. This might make debug more difficult and lead to some implementation confusion.
> We do make the distinction elsewhere in the spec e.g., 
> 3.1.3.4 User Name
> If the User Name Flag is set to 1, the User Name is the next field in the Payload. The User Name MUST be a UTF-8 Encoded String as defined in Section 1.5.4 [MQTT-3.1.3-10]. It can be used by the Server for authentication and authorization.



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