Hi @Srikanth_bethi,
As @amackenzie said in the other thread the MQTT5 specification does not include queues and b/c of that the MQTT libraries won’t allow you to explicitly connect to a queue. But Solace’s implementation of QoS uses queues under the covers.
Please refer to this thread for a bit more info: Queue-Based Message Consumption Using CocoaMQTT in Solace in iOS swift - #6 by amackenzie