[ https://issues.oasis-open.org/browse/MQTT-257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=63047#comment-63047 ]
Ed Briggs commented on MQTT-257:
--------------------------------
Thank you Ian and Ken. I'll clarify the text as you suggest. In response to Ken's last item, the flow control mechanism applies only to PUBLISH messages sent at QOS > 0. No other messages are 'throttled' by this mechanism.
> Flow Control
> ------------
>
> Key: MQTT-257
> URL: https://issues.oasis-open.org/browse/MQTT-257
> Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
> Issue Type: Bug
> Components: futures
> Affects Versions: 5
> Reporter: Peter Niblett
>
> Developers sometimes ask if there's a way to slow down an MQTT message sender to stop it sending PUBLISH packets faster than the receiver (be it a server or client) is able to process them.
> The receiver can apply back pressure at the TCP/IP level (if it's a TCP/IP transport) or - for QOS 1 and QOS2 - it can delay sending acks so that eventually the sender's inflight message window will fill up, but these mechanisms are a bit crude, and the receiver has no in-band way of letting the sender know what rate is acceptable to it.
> We need to decide whether this is a problem that affects a significant number of existing or envisaged real-life applications (as opposed to performance and stress tests)
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