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Home » Eclipse Projects » Mosquitto » Duplicate message(Broker forwarding of duplicate message)
Duplicate message [message #1827742] Fri, 22 May 2020 10:36
Giacomo Genovese is currently offline Giacomo GenoveseFriend
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
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.

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