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Subject: [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: Â 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 -- This message was sent by Atlassian Jira (v8.3.3#803004)
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