未通过websockets接收来自蚊子的有效负载

Question

我正在使用VPS，并通过MQTT将数据从Arduino发送到服务器。

Mosquitto成功地通过终端打印有效载荷，但当我尝试通过网页实时打印它时，没有任何反应。

知道我已经在Mosquitto conf中允许websockets，如果我运行：

sudo netstat -plnt

我得到了：

tcp        0      0 0.0.0.0:1883            0.0.0.0:*               LISTEN      
13248/mosquitto
tcp        0      0 0.0.0.0:1884            0.0.0.0:*               LISTEN      
20169/mosquitto
tcp6       0      0 :::1883                 :::*                    LISTEN      13248/mosquitto

我发送的主题name : /pression和我使用的代码是：

  <script>

    var websocket="myserver.ovh.net";
    var port= 1884;
    var user="username";
    var pass="password";


    client = new Paho.MQTT.Client(websocket, port, "innovation");


     // set callback handlers
     client.onConnectionLost = onConnectionLost;
     client.onMessageArrived = onMessageArrived;

  var options = {
   useSSL: false,
   userName: user,
   password: pass,
   onSuccess:onConnect,
   onFailure:doFail
}

// connect the client

client.connect(options);


// called when the client connects

 function onConnect() {
// Once a connection has been made, make a subscription and send a 
message.


 document.getElementById("connstatus").innerHTML = "Mqtt Connected";

 console.log("Mqtt Connected");

  client.subscribe("/pression");

    }

    function doFail(e){
    console.log(e);
   }

   // called when the client loses its connection
    function onConnectionLost(responseObject) {

  document.getElementById("connstatus").innerHTML = "Mqtt Not Connected";

     if (responseObject.errorCode !== 0) {
         console.log("onConnectionLost:"+responseObject.errorMessage);
    }
   }

   function onMessageArrived(message) {
   console.log("Pression is :");
   document.getElementById("connstatus").innerHTML = message.payloadString;
   console.log(message.payloadString);

   }


  </script>

当我运行脚本时，它显示"Mqtt已连接“，而不是什么都没有发生。

但是，如果我在终端中运行：

         mosquitto_sub -t '/pression'

我得到了压力值。

如果我让网页打开几分钟，我会得到这样的信息：

       Mqtt Connected
       test.html:76 onConnectionLost:AMQJS0008I Socket closed.

配置文件：

   # Place your local configuration in /etc/mosquitto/conf.d/
   #
   # A full description of the configuration file is at
   # /usr/share/doc/mosquitto/examples/mosquitto.conf.example

   pid_file /var/run/mosquitto.pid

   persistence true
   persistence_location /var/lib/mosquitto/

   log_dest file /var/log/mosquitto/mosquitto.log

   include_dir /etc/mosquitto/conf.d

   #password_file /etc/mosquitto/passwd
   #allow_anonymous false



   listener 1884
   protocol websockets

蚊子记录：

       1557922249: Config loaded from /etc/mosquitto/mosquitto.conf.
       1557922249: Opening websockets listen socket on port 1884.
       1557922254: New client connected from xx.xx.11.163 as innovation (c1, k60, u'innovation').
       1557922279: Socket error on client innovation, disconnecting.
       1557922279: New client connected from xx.xx.11.163 as innovation (c1, k60, u'innovation').
       1557922318: Socket error on client innovation, disconnecting.
       1557922318: New client connected from xx.xx.11.163 as innovation (c1, k60, u'innovation').
       1557922346: Socket error on client innovation, disconnecting.
       1557922346: New client connected from xx.xx.11.163 as innovation (c1, k60, u'innovation').
       1557922363: Socket error on client innovation, disconnecting.
       1557922364: New client connected from xx.xx.11.163 as innovation (c1, k60, u'innovation').
       1557922463: Socket error on client innovation, disconnecting.

Answer 1

好的，这里的问题很可能是你在超文本标记语言中使用了一个固定的客户id (innovation)。

您只能有一个客户端与给定的客户端id连接，因此当具有相同id的新客户端连接时(例如，当您重新加载页面时)，代理将断开最旧的客户端。

尝试将连接线更改为如下所示：

var clientID = "innovation_" + new Date().getTime();
client = new Paho.MQTT.Client(websocket, port, clientID);