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Subject: [OASIS Issue Tracker] (MQTT-438) Review comments from Peter

Richard Coppen created MQTT-438:

             Summary: Review comments from Peter
                 Key: MQTT-438
                 URL: https://issues.oasis-open.org/browse/MQTT-438
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Bug
          Components: core
    Affects Versions: 5, wd14
            Reporter: Richard Coppen

Review comments from Peter (wd14)

1. Normative / non-Normative

i) At the moment we don't have any normative requirements on underlying transport protocols. That looks a bit odd, but I am ok with that (I think this was a decision we made in 3.1.1). However  TLS and WebSocket are listed as Normative references

ii) 4.10.2 (determining a response topic) is shown as Non-Normative, but I think it makes sense to have it Normative, as it includes the statement that the Response Info property is OPTIONAL.

iii) 4.11 (Server redirection) includes Normative language, e.g. "the Server MAY also send a Server Reference to indicate the location of the Server or Servers the Client SHOULD use.".   However the format of Server Reference is vendor-specific, so I don't see how we can make normative statements about it.

3. Error handling on QoS 2.  

i) We don't say anything about errors in 4.3.3. Should the sender abandon the flow if it gets an error on PUBREC?

ii) When does a packet id become available for reuse if an error occurs?

iii) What is the meaning of 0x91 - Packet identifier in use?  When should it be used, and what should you do if you receive a packet that contains it?

4. Flow control paragraph

Simplify description

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