JIRA: https://jira.spring.io/browse/INT-4463 Certain options, such as `maxInFlight` were not exposed. Deprecate the setters on the factory and allow the user to inject a pre-configured `MqttConnectOptions`, thus making all (and any new) properties available to be configured. # Conflicts: # spring-integration-mqtt/src/test/java/org/springframework/integration/mqtt/MqttAdapterTests.java