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Duplicate message [message #1827742]

Fri, 22 May 2020 10:36

Giacomo Genovese

Messages: 1
Registered: May 2020

Junior Member

Hi All,

I wonder if it's possible that a Pubblish message with QoS>0 could be sent twice to subscribers.
I thought no but then I read this on OASIS Spec. in section 2.1.2.1-DUP:
Quote:

When using QoS 1, it is possible for a Client to receive a PUBLISH Packet with DUP set to 0 that contains a repetition of an Application Message that it received earlier, but with a different Packet Identifier.

So, here doubt comes to me. Could it happen in the MQTT mosquitto implementation ?
If yes, How?
I think it could happen only if the client publishing the message makes the error to send twice the same message with different ID.

Thanks in advance for your help.

Bests,
G.

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