in src/main/java/com/awslabs/aws/iot/websockets/BasicMqttOverWebsocketsProvider.java [105:111]
public Optional<IMqttToken> connect(MqttAsyncClient mqttAsyncClient, ImmutableUsernamePassword usernamePassword, Object userContext, IMqttActionListener callback) throws MqttException {
MqttConnectOptions connOpts = new MqttConnectOptions();
connOpts.setCleanSession(true);
setUsernamePassword(usernamePassword, connOpts);
return Optional.of(mqttAsyncClient.connect(connOpts, userContext, callback));
}