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Subject: [OASIS Issue Tracker] Commented: (MQTT-4) Flowing MQTT messages before CONNACK is received in the client.

    [ http://tools.oasis-open.org/issues/browse/MQTT-4?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33857#action_33857 ] 

Andrew Banks commented on MQTT-4:

Two further points on this. 
1) The current specification permits the client to send packets before it has received the connack, I say this on the basis that it does not explicitly ban it.
2) A conformance test for the client would have to read the CONNECT packet, not respond with a CONNACK and then try to make the client send a SUBSCRIBE UNSUBSCRIBE DISCONNECT etc. The test would have to wait an arbitrary amount of time to decide if the client had buffered the data waiting for the CONNACK. 

> Flowing MQTT messages before CONNACK is received in the client.
> ---------------------------------------------------------------
>                 Key: MQTT-4
>                 URL: http://tools.oasis-open.org/issues/browse/MQTT-4
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: core
>         Environment: MQTT Client
>            Reporter: Andrew Banks
> The MQTT Client sends CONNECT and receives  CONNACK in response. Should the client have to wait for the CONNACK or is it free to send other commands before it receives the CONNACK?
>  The advantages of allowing the client to proceed before receiving the CONNACK are:
> 1) Simpler client implementation, because the API does not have to police the connected state.
> 2) Lower latency because the client application does not have to wait for the CONNACK.

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