Email to comments list from Takatoshi Kondo:

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