android - 代理不传递 LWT 消息？

Question

我让他LWT topic跟着WT message

private final String WILL_TOPIC = "sensor_0_LWT";
private final String WILL_MSG = "LWT: Unexpected Connection Drop Down";

当我发布消息时，我订阅了一个topic名称sensor_0，但当我关闭 WiFi 并再次打开它时，我希望看到LWT messahe我在连接选项中设置的，但发生的情况是我没有收到它.

为什么我重新连接时没有收到LWT消息？

代码：

final MqttClientPersistence persistenceDataDir = new   
MqttDefaultFilePersistence(folder.toString());

    final MqttAndroidClient client_1 = new MqttAndroidClient(getApplicationContext(), serverURI,   
    clientID, persistenceDataDir, Ack.AUTO_ACK);

    MqttConnectOptions opts = new MqttConnectOptions();
    opts.setCleanSession(false);
    opts.setWill(WILL_TOPIC, WILL_MSG.getBytes(), 1, true);
    opts.setKeepAliveInterval(keepAliveInterval);