List of topic filters that the client wishes to unsubscribe from.
Optional
userSet of MQTT5 user properties included with the packet.
Optional
typeAlways set on packets coming from the client to the user. Ignored if set on packets that come from the user to the client.
The primary use is to allow users to distinguish between packets in polymorphic situations (for example, the result of a publish attempt which might be a Puback (QoS 1) or Pubcomp (QoS 2, when we support it).
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Data model of an MQTT5 UNSUBSCRIBE packet.