2023-02-08T01:48:05.492147629Z org.eclipse.paho.client.mqttv3.MqttException: Broker unavailable
2023-02-08T01:48:05.492153063Z at org.eclipse.paho.client.mqttv3.internal.ExceptionHelper.createMqttException(ExceptionHelper.java:31)
2023-02-08T01:48:05.492156863Z at org.eclipse.paho.client.mqttv3.internal.ClientState.notifyReceivedAck(ClientState.java:1040)
2023-02-08T01:48:05.492160937Z at org.eclipse.paho.client.mqttv3.internal.CommsReceiver.run(CommsReceiver.java:151)
2023-02-08T01:48:05.492164880Z at java.lang.Thread.run(Thread.java:750)