[OASIS Issue Tracker] (MQTT-58) How many messages are received for overlapping subscriptions?

[ https://issues.oasis-open.org/browse/MQTT-58?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=63617#comment-63617 ] 

Andrew Banks commented on MQTT-58:
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MQTT253 (add subscription ids) tried to  address this but was abandoned. Other ways to address this, might be:

- Require that a server that sends multiple messages should mark all but the first message as repeat a message.
- A server should announce on CONNACK that it is going to send multiple responses when needed.
- The server should add a unique identifier to a publish message so that the client can eliminate the repeat messages
  if it needs to.

> How many messages are received for overlapping subscriptions?
> -------------------------------------------------------------
>
>                 Key: MQTT-58
>                 URL: https://issues.oasis-open.org/browse/MQTT-58
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 3.1.1
>            Reporter: Allan Stockdill-Mander
>            Assignee: Andrew Banks
>             Fix For: 3.1.1
>
>
> A client has subscribed to a/+ with QoS2 and a/b with QoS1. A message is published to a/b. Does the client receive one or two messages? If one which QoS would apply?



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