[OASIS Issue Tracker] (MQTT-538) Clarify SessionExpiry value for MQTT 5.0 equivalence of CleanSession to 0

Richard Coppen created MQTT-538:
-----------------------------------

             Summary: Clarify SessionExpiry value for MQTT 5.0 equivalence of CleanSession to 0
                 Key: MQTT-538
                 URL: https://issues.oasis-open.org/browse/MQTT-538
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Bug
          Components: core
    Affects Versions: 5
         Environment: Implementers of MQTT 5.0 and those migrating from 3.1.1
            Reporter: Richard Coppen


Email to comments list fromÂTakatoshi Kondo:

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Hi,
 
 I have a comment about the following part of MQTT Version 5.0 document:
 
 https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.oasis-2Dopen.org_mqtt_mqtt_v5.0_os_mqtt-2Dv5.0-2Dos.html-23-5FToc3901048&d=DwIFaQ&c=jf_iaSHvJObTbx-siA1ZOg&r=HFOYf-FWdPMlPq2g5pc8M7HUYiSp2sC9P2hDoZdjdRo&m=cA-Wf0Sm4lOyst4wG_JZAokBhagLMEshsXwWx1SZCa4&s=4QRoSC7d0BF5IMtW5-G3y_ZW9ZyAbSTS74i_dfysi_k&e= 
 
 > 3.1.2.11.2 Session Expiry Interval
 >
 > ...snip...
 >
 > Non-normative comment
 >
 > Setting Clean Start to 1 and a Session Expiry Interval of 0, is equivalent to setting CleanSession to 1 in the MQTT Specification Version 3.1.1. Setting Clean Start to 0 and no Session Expiry Interval, is equivalent to setting CleanSession to 0 in the MQTT Specification Version 3.1.1.
 
 I thin that "Setting Clean Start to 0 and no Session Expiry Interval,
 is equivalent to setting CleanSession to 0 in the MQTT Specification
 Version 3.1.1." is not correct.
 
 Because "no Session Expiry Interval" is equivalent to set to 0.
 
 The spec said that as follows:
 
 > If the Session Expiry Interval is absent the value 0 is used. If it is set to 0, or is absent, the Session ends when the Network Connection is closed.
 >
 > If the Session Expiry Interval is 0xFFFFFFFF (UINT_MAX), the Session does not expire.
 
 So I think that the sentence
 
 "Setting Clean Start to 0 and no Session Expiry Interval, is
 equivalent to setting CleanSession to 0 in the MQTT Specification
 Version 3.1.1."
 
 should be something like as follows:
 
 "Setting Clean Start to 0 and a Session Expiry Interval of
 0xFFFFFFFF(UINT_MAX), is equivalent to setting CleanSession to 0 in
 the MQTT Specification Version 3.1.1."
 
 Am I missing something?
 
 Thanks,
 Takatoshi



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