Re: (MQTT-65) Should the QoS flag for PUBREL, SUBSCRIBE and UNSUBSCRIBE be reserved ?

[Roger Light <roger@atchoo.org>]

Hello,

The mosquitto broker and clients set the fixed header QoS bits to 1
for PUBREL, SUBSCRIBE and UNSUBSCRIBE. On receipt of one of those
messages they don't verify if QoS is set to 1 however, because it's
already clear what needs to be done.

It feels as though specifying the QoS here is more notional/for
completeness than in the PUBLISH case. It doesn't provide any extra
information.

Cheers,

Roger