Queue-Based Message Consumption Using CocoaMQTT in Solace in iOS swift

No. MQTT has no concept of queues. You connect to a topic with a QoS. If it’s QoS1, it will consume messages from a persistent store (which is a queue under the covers in the Solace MQTT broker) but you always connect to a topic.
This is not unique to Solace PubSub+. It’s the MQTT spec.

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