List of topic filter subscriptions that the client wishes to listen to
Optional subscriptionA positive integer to associate with all subscriptions in this request. Publish packets that match a subscription in this request should include this identifier in the resulting message.
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 SUBSCRIBE packet.