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In section 3.3.1.3 of the published v5 spec, MQTT-3.3.1-10 is described as: > If Retain Handling is set to 1 then if the subscription did not already exist, the Server MUST send all retained message matching the Topic Filter of the subscription to the Client, and if the subscription did exist the Server ...

Okay, let's say it is a property of the subscription and can be used with any topic. It would be helpful to me if we could flesh out the expected/desired behaviour in the following scenarios. Both Andrews have implied the existence of a share name that goes alongside the topic. I presume that is so you ...

There are two fundamental approaches here. 1. The client chooses whether a subscription is shared or not 2. The ??shared ?? nature is a property of the topic itself If the client gets to choose, then you need to define what happens if clients A and B subscribe to topic foo with the shared flag set, but ...