8c57cb7869
Fixes https://github.com/spring-projects/spring-integration/issues/3697 SO: https://stackoverflow.com/questions/70374046/spring-integration-mqtt-failed-to-start-app-when-the-network-is-disconnected * Add `mqttClient.disconnect()` to `Mqttv5PahoMessageDrivenChannelAdapter.doStop()` - the `doStart()` does `connect()` * Add `Mqttv5PahoMessageDrivenChannelAdapter.destroy()` impl to close `mqttClient` * Fix `Mqttv5PahoMessageHandler.doStart()` to not re-throw an exception on connection. Emit an `MqttConnectionFailedEvent` and log error instead * Fix `Mqttv5PahoMessageHandler.destroy()` to call `mqttClient.close(true)` for better resources clean up * Improve MQTT v5 components Javadocs and add a reconnect note into `mqtt.adoc`