Can MQTT iOS client subscribe to the queue?

PubSub+ Event Broker
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Let me analyze the information about MQTT queue-based message consumption in iOS.

The documentation indicates that while MQTT doesn’t natively support direct queue consumption, Solace implements queue functionality under the hood for MQTT connections with specific configurations:

  1. For persistent message consumption with MQTT v5:
  • Set Clean Session to false
  • Use the same client ID consistently
  • Use QoS1 for subscriptions
  • Configure session expiry interval in connect properties
  1. For WebSocket connections:
  • Port 8443 is used for MQTT over WebSocket Secure (WSS)
  • Port 8883 is used for MQTT over SSL/TLS

The code you shared needs some adjustments to enable persistent message consumption:

  1. Set cleanSession to false
  2. Configure a non-zero sessionExpiryInterval
  3. Use QoS1 for subscriptions

MQTT v5 is recommended over MQTT 3.1.1 for better features and interoperability with Solace event brokers.

Here are relevant sources for more information: