Question

Broker和Publisher在一台计算机上运行，而订阅服务器在另一台计算机上运行。问题：订户没有收到已发布的消息。

如果代理，发布者和订阅者在同一台计算机上运行，则代码可以正常工作。

subscriber.js

var client = mqtt.connect('mqtt://192.168.10.6:1234');

192.168.10.6:1234 是运行代理和发布者的计算机的IP地址。

Broker.js

const aedes = require('aedes')()
const server = require('net').createServer(aedes.handle)
const port = 1234

server.listen(port, function () {
  console.log('server started and listening on port ', port)
})

Publisher.js

const express= require('express')
const mqtt = require('mqtt');
const app = express();

var client = mqtt.connect('mqtt://127.0.0.1:1234');
topic = "greeting";
msg = "hello";


app.get('/', (req,res) => {

    client.publish(topic,msg);
    res.send("Mqtt just published a message")
})
app.listen(5000);

Subscriber.js

var mqtt = require('mqtt')
var client = mqtt.connect('mqtt://192.168.10.6:1234');
topic = "greetings"

client.on('connect', ()=> {
    client.subscribe(topic)
})

client.on('message', (topic, payload) => {
    payload= payload.toString();
    console.log(payload);
})

Mqtt.js订阅服务器未收到发布的消息

0 个答案: