web -- js 实现 MQTT 连接

先上链接

流程：

var mqtt = require('mqtt')

var clientId = 'mqttjs_' + Math.random().toString(16).substr(2, 8)

var host = 'wss://localhost:3001/Mosca'

var options = {
  keepalive: 10,
  clientId: clientId,
  protocolId: 'MQTT',
  protocolVersion: 4,
  clean: true,
  reconnectPeriod: 1000,
  connectTimeout: 30 * 1000,
  will: {
    topic: 'WillMsg',
    payload: 'Connection Closed abnormally..!',
    qos: 0,
    retain: false
  },
  username: 'demo',
  password: 'demo',
  rejectUnauthorized: false
}

var client = mqtt.connect(host, options)

client.on('error', function (err) {
  console.log(err)
  client.end()
})

client.on('connect', function () {
  console.log('client connected:' + clientId)
})

client.subscribe('topic', { qos: 0 })

client.publish('topic', 'wss secure connection demo...!', { qos: 0, retain: false })

client.on('message', function (topic, message, packet) {
  console.log('Received Message:= ' + message.toString() + '\nOn topic:= ' + topic)
})

client.on('close', function () {
  console.log(clientId + ' disconnected')
})

注意事项

客户端的默认端口是 8083 不是 1883

Protocol	Listen On	Max Clients	Current Clients
mqtt:wss	8084	64	0
mqtt:ssl	8883	1024	0
mqtt:ws	8083	64	0
mqtt:tcp	0.0.0.0:1883	102400	0
mqtt:tcp	127.0.0.1:11883	102400	0
dashboard:http	18083	512	4

出现无限连接是因为数据没有发送成功，于是会一直连接，直到连接成功。

Qos	说明
0	已发送
1	服务端确认收到
2	都确认收到

https://github.com/0123cf/MQTT.js