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java.net.ConnectException: Connection refused

Steps to reproduce the behavior, e.g.: 1、Connect the USB to the real Huawei Pad device. at java.base/sun.nio.ch.Net.connect0(Native Method) at java.base/sun.nio.ch ...
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How to detect “Connection refused” when using MqttAsyncClient with no automatic reconnect?

I am using Eclipse Paho Java Client version 1.1.0 to connect. Here is my extended callback: protected IMqttAsyncClient mClient; private final MqttCallbackExtended mCallback = new MqttCallbackExtended( ...