[OASIS Issue Tracker] (MQTT-381) 3.3.1.3 RETAIN - comments

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

Brian Raymor created MQTT-381:
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             Summary: 3.3.1.3 RETAIN - comments
                 Key: MQTT-381
                 URL: https://issues.oasis-open.org/browse/MQTT-381
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Bug
          Components: edits
    Affects Versions: 5, wd10
            Reporter: Brian Raymor
            Priority: Minor
             Fix For: 5, wd10


Rather than describing mechanisms (if this bit is set in this control packet), could we simplify these cases throughout the document? For example:

1632 If the Server included Retain Available in its CONNACK response to a Client with it’s value set to 0 and it
1633 receives a PUBLISH Packet with the RETAIN flag is set to 1

might be easier to read as:

If the server does not support message retention (see Retain Available section) and receives a PUBLISH Packet with the Retain Flag set to 1,
then ka-boom.

2.the last retained message [is] sent to the Client with its RETAIN flag set to 1.

1636 When a new non-shared subscription is established, the last retained message, if any, on each matching
1637 topic name are sent to the Client. These messages are sent with the RETAIN flag set to 1.

3. The Retain Handling Subscription Option controls which retained messages are sent.

1637 ... Which
1638 retained messages are sent is controlled by the Retain Handling Subscription Option.

4. , [the] Server MUST NOT

1644 • If Retain Handling is set to 2, The Server MUST NOT send retained messages at the time of the
1645 subscribe.

5. If the server receives a  PUBLISH Packet with the RETAIN=1 and QoS=0, it SHOULD store the message as the new retained message for that topic. It MAY also choose to discard it ...

1647 If the Server receives a PUBLISH Packet with the RETAIN flag set to 1, and QoS 0 it SHOULD store the
1648 new QoS 0 message as the new retained message for that topic, but MAY choose to discard it at any
1649 time.





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