Paho Mqtt Android Library连接问题

Question

我正在尝试将mqtt与PAHO Mqtt安卓库连接。但它对我不起作用。我认为我的服务器uri无效，但我不确定。

              val clientId = MqttAsyncClient.generateClientId();
              val url = "wss://xxxxxxx.iot.us-east-1.amazonaws.com/mqtt?...."
              client = MqttAndroidClient(this,url, clientId)
                val token = client.connect()
                token.actionCallback = object : IMqttActionListener {
                    override fun onSuccess(asyncActionToken: IMqttToken) {
                        // We are connected
                        Log.i(TAG,"onSuccess")
                    }
                    override fun onFailure(asyncActionToken: IMqttToken, exception: Throwable) {
                        exception.printStackTrace()
                        Log.i(TAG,"onFailure")
                    }
            }

我在logcat中看到MqttException（0）。为了解异常原因，我查看了MqttException类的decleration。我看到了：

public class MqttException extends Exception {
    public static final short REASON_CODE_CLIENT_EXCEPTION              = 0x00;
}

Shorty，我不知道为什么它没有连接到mqtt。