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Can not connect to Ryuk at localhost:32768 java.net.ConnectException: Connection refused (Connection refused)

[testcontainers-ryuk] - Can not connect to Ryuk at localhost:32768 java.net.ConnectException: Connection refused (Connection refused) at java.net.PlainSocketImpl.socketConnect(Native Method) at ...
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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( ...