Question

我正在尝试创建一个消耗各种主题的API。为此，我尝试多线程，以便整个事情可以扩展到多个API，稍后，但这是非常重要的。

我使用ASP.net Core 4.0，如果它与它有关。实体框架也是如此。

我的问题是基于我与Mosquitto服务器的连接被破坏而没有抛出异常或类似的东西，一分钟左右。消息的大小或交换的数量并不重要。我不知道如何创建一个回调或类似的东西来了解我的连接发生了什么。有人可以帮忙吗？

我将链接我用来建立连接的代码并订阅下面的连接。使用Subscribe方法或手动执行也不会改变任何内容。我在这里不知所措。

提前致谢！

Main.cs：

Task.Factory.StartNew(() => DataflowController.ResumeQueuesAsync());
BuildWebHost(args).Run();

DataflowController.cs：

public static Boolean Subscribe(String topic)
    {

        Console.WriteLine("Hello from " + topic);

        MqttClient mqttClient = new MqttClient(brokerAddress);
        byte code = mqttClient.Connect(Guid.NewGuid().ToString());

        // Register to message received
        mqttClient.MqttMsgPublishReceived += client_recievedMessageAsync;

        string clientId = Guid.NewGuid().ToString();
        mqttClient.Connect(clientId);

        // Subscribe to topic
        mqttClient.Subscribe(new String[] { topic }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
        System.Console.ReadLine();

        return true;
    }

    public static async Task ResumeQueuesAsync()
    {
        var mongoClient = new MongoClient(connectionString);
        var db = mongoClient.GetDatabase(databaseName);

        var topics = db.GetCollection<BsonDocument>(topicCollection);
        var filter = new BsonDocument();
        List<BsonDocument> result = topics.Find(filter).ToList();
        var resultSize = result.Count;
        Task[] subscriptions = new Task[resultSize];

        MqttClient mqttClient = new MqttClient(brokerAddress);
        byte code = mqttClient.Connect(Guid.NewGuid().ToString());

        // Register to message received
        mqttClient.MqttMsgPublishReceived += client_recievedMessageAsync;

        string clientId = Guid.NewGuid().ToString();
        mqttClient.Connect(clientId);


        int counter = 0;
        foreach(var doc in result)
        {

            subscriptions[counter] = new Task(() =>
            {
                Console.WriteLine("Hello from " + doc["topic"].ToString());
                // Subscribe to topic
                mqttClient.Subscribe(new String[] { doc["topic"].ToString() }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
                System.Console.ReadLine();
            });
            counter++;
        }

        foreach(Task task in subscriptions)
        {
            task.Start();
        }
    }

    static async void client_recievedMessageAsync(object sender, MqttMsgPublishEventArgs e)
    {
        // Handle message received
        var message = System.Text.Encoding.Default.GetString(e.Message);
        var topic = e.Topic;

        var id = topic.Split("/")[2];

        BsonDocument doc = new BsonDocument {
            {"Plug ID", id },
            {"Consumption", message }
        };

        await Save(doc, "smartPDM_consumption");

        System.Console.WriteLine("Message received from " + topic + " : " + message);
    }

Answer 1

这是问题所在：

byte code = mqttClient.Connect(Guid.NewGuid().ToString());

删除它，就可以了。

M2MQTT客户端断开连接，没有异常或错误消息

1 个答案: