Adding Documentation for MqttPahoMessageDrivenChannelAdapter and Mqttv5PahoMessageDrivenChannelAdapter

Author: Ricore72

src/reference/antora/modules/ROOT/pages/mqtt.adoc

@@ -548,3 +548,19 @@ public IntegrationFlow mqttOutFlow(
     return f -> f.handle(new Mqttv5PahoMessageHandler(clientManager));
 }
 ----
+
+NOTE: Starting with version 6.4, multiple instances of `MqttPahoMessageDrivenChannelAdapter` and `Mqttv5PahoMessageDrivenChannelAdapter` can now be added at runtime using corresponding `ClientManager` through `IntegrationFlowContext`
+
+[source,java]
+----
+private void addAddRuntimeAdapter(IntegrationFlowContext flowContext,Mqttv5ClientManager clientManager,
+								  String topic,MessageChannel channel){
+	flowContext
+		.registration(
+			IntegrationFlow
+				.from(new Mqttv5PahoMessageDrivenChannelAdapter(clientManager, topic))
+				.channel(channel)
+				.get())
+		.register();
+}
+----

src/reference/antora/modules/ROOT/pages/whats-new.adoc

@@ -59,4 +59,10 @@ See xref:redis.adoc[Redis Support] for more information.
 === Groovy Changes
 
 The `ControlBusFactoryBean` (and respective `<int-groovy:control-bus>` XML tag) has been deprecated (for removal) in favor of new introduced `ControlBusFactoryBean` based on a new model implemented in the `ControlBusCommandRegistry`.
-See xref:control-bus.adoc[Control Bus] for more information.
+See xref:control-bus.adoc[Control Bus] for more information.
+
+[[x6.4-mqtt-changes]]
+=== mqtt Changes
+
+Multiple instances of `MqttPahoMessageDrivenChannelAdapter` and `Mqttv5PahoMessageDrivenChannelAdapter` can now be added at runtime using corresponding `ClientManager` through `IntegrationFlowContext`
+See xref:mqtt.adoc[MQTT Support] for more information.