mqtt message

Subject: [OASIS Issue Tracker] (MQTT-559) DISCONNECT duration 16-bit field does not allow long enough to sleep

From: OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>
To: mqtt@lists.oasis-open.org
Date: Wed, 8 Jul 2020 13:30:00 +0000 (UTC)

    [ https://issues.oasis-open.org/browse/MQTT-559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=77338#comment-77338 ] 

Ian Craggs commented on MQTT-559:
---------------------------------

The duration field on disconnect is called the session expiry interval in MQTT 5.0 and is 4 bytes.Â We should adopt both the terminology and the size of the field.

> DISCONNECT duration 16-bit field does not allow long enough to sleep
> --------------------------------------------------------------------
>
>                 Key: MQTT-559
>                 URL: https://issues.oasis-open.org/browse/MQTT-559
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: MQTT-SN
>    Affects Versions: MQTT-SN-1.2
>            Reporter: Simon Johnson
>            Assignee: Allan Stockdill-Mander
>            Priority: Minor
>
> Assuming the time unit of a DISCONNECTED sleep session is SECONDS, per the 1.2 specification, this only allows a sleeping period of 18 hours 12 minutes and 15 seconds. This is not enough for real-world LPWAN devices. We need to somehow accommodate more space for larger durations OR change the time unit of the duration field to be minutes (which would allow for ~45 days sleeping).



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