Question

我是MQTT和node.js的新手，所以如果我没有弄清楚所有条款的正确性，也请理解所有部分是如何组合在一起的，请原谅我

我试图效仿这个例子：http://blog.hekkers.net/2012/10/13/realtime-data-with-mqtt-node-js-mqtt-js-and-socket-io/

我似乎无法做到正确，html页面永远不会显示主题的值/有效负载。

据我了解，node.js文件和html文件有两个文件。对于node.js文件，我安装了所需的模块：socket.io和MQTTClient.js。我的node.js文件 - pusher.js：

var sys = require('sys');
var net = require('net');
var mqtt = require('./node_mqtt_client/MQTTClient.js');

var io  = require('socket.io').listen(5000);
var client = new mqtt.MQTTClient(1883, '192.168.1.108', 'pusher');

io.sockets.on('connection', function (socket) {
    socket.on('subscribe', function (data) {
    console.log('Subscribing to '+data.topic);
    client.subscribe(data.topic);
  });
});

client.addListener('mqttData', function(topic, payload){
  sys.puts(topic+'='+payload);
  io.sockets.emit('mqtt',{'topic':String(topic),'payload':String(payload)});
});

108 IP是RabbitMQ Broker的IP。

似乎加载正常，当我访问html文件时，控制台会输出以下信息：

info  - socket.io started
Connected as :pusher
Session opend
   debug - client authorized
   info  - handshake authorized FAxJSO4DUEXV5wi50E-k
   debug - setting request GET /socket.io/1/websocket/FAxJSO4DUEXV5wi50E-k
   debug - set heartbeat interval for client FAxJSO4DUEXV5wi50E-k
   debug - client authorized for 
   debug - websocket writing 1::
Subscribing to aujen/weather/current/pressure
Subcribe to:aujen/weather/current/pressure
Connection closed by broker
   info  - transport end (undefined)
   debug - set close timeout for client FAxJSO4DUEXV5wi50E-k
   debug - cleared close timeout for client FAxJSO4DUEXV5wi50E-k
   debug - cleared heartbeat interval for client FAxJSO4DUEXV5wi50E-k
   debug - discarding transport
   debug - client authorized
   info  - handshake authorized AqzQ60WhMDA1_Ddv0E-l
   debug - setting request GET /socket.io/1/websocket/AqzQ60WhMDA1_Ddv0E-l
   debug - set heartbeat interval for client AqzQ60WhMDA1_Ddv0E-l
   debug - client authorized for 
   debug - websocket writing 1::
Subscribing to aujen/weather/current/pressure
MQTT connect to server time out
   debug - emitting heartbeat for client AqzQ60WhMDA1_Ddv0E-l
   debug - websocket writing 2::
   debug - set heartbeat timeout for client AqzQ60WhMDA1_Ddv0E-l
   debug - got heartbeat packet

对于html部分，我已经安装了apache来托管页面 - 普通的apache没有额外的模块。我还下载了所需的库文件，并将它们放在与我的html文件相同的文件夹中：socket.io.min.js和jquery-1.4.2.js。我的html文件如下：index.html

<h1>Real Time</h1>
<script type="text/javascript" src="socket.io.min.js"></script>
<script type="text/javascript" src="jquery-1.4.2.js"></script>
<script type="text/javascript">
  var socket = io.connect('http://192.168.1.106:5000');
    socket.on('connect', function () {
      socket.on('mqtt', function (msg) {
        var elmarr=msg.topic.split("/");
        var elm=elmarr[3];
        console.log(msg.topic+' '+msg.payload);
        $('#'.concat(elm)).html(msg.payload);
     });
     socket.emit('subscribe',{topic:'aujen/weather/current/pressure'});
    });
</script>
<table class="tablegv" style="width: 500px;">
<tbody>
<tr class="tablegvHeader">
<td colspan="2"><center>Status</center></td>
</tr>
<tr>
<td>Return temp</td>
<td id="pressure"></td>
</tr>
</tbody>
</table>

106 IP是我的node.js服务器的IP。

html页面不显示值/有效负载？主题，也不是pusher.js（不确定是否应该）

我知道我的经纪人（RabbitMQ）正在工作，因为我还练习创建一个订阅主题的python脚本，并显示值/有效负载？。

python mqtt_sub.py 
rc: 0
Subscribed: 1 (0,)
aujen/weather/current/pressure 0 856.64
aujen/weather/current/temperature 0 25.63
aujen/weather/current/humidity 0 37

aujen/weather/current/pressure 0 856.67
aujen/weather/current/temperature 0 25.63
aujen/weather/current/humidity 0 36

aujen/weather/current/pressure 0 856.59
aujen/weather/current/temperature 0 25.62
aujen/weather/current/humidity 0 37

我似乎无法找到许多尝试使用此方法与代理集成的示例，大多数示例从js文件调用mosquitto_sub客户端 - 对此不太热衷。

希望有人可以指出我做错了什么。非常感谢你。

Answer 1

我在使用RabbitMQ + MQTT插件时遇到了同样的错误。在我将MQTT经纪人改为mosquitto后，没关系。

我尝试将MQTT客户端更改为node.js（npm install mqtt）的mqtt插件，而不是node_mqtt_client / MQTTClient.js。当我使用它时，我可以使用RabbitMQ + MQTT插件而不会出错。但在这种情况下，我需要稍微改变一下pusher.js。

var sys = require('sys');
var net = require('net');
var mqtt = require('mqtt');

var io  = require('socket.io').listen(5000);
var client = mqtt.createClient(1883, '127.0.0.1');

client.options.reconnectPeriod = 0;

client.on('message', function(topic, message) {
  console.log(message);
  sys.puts(topic+'='+message);
  io.sockets.in(topic).emit('mqtt',{'topic': String(topic), 'payload':String(message)});
});

io.sockets.on('connection', function (socket) {
  socket.on('subscribe', function (data) {
    console.log('Subscribing to '+data.topic);
    socket.join(data.topic);
    client.subscribe(data.topic);
  });
});

通过node.js和socket访问mqtt代理

1 个答案: