1.启用插件
javascript
rabbitmq-plugins enable rabbitmq_mqtt
2.检查是否启动成功,打开rabbitmq后台
3.概念:
AMQP是由交换器和queue队列组成的消息队列机制,MQTT是由订阅主题组成的消息机制
1.MQTT创建连接时会向rabbitmq创建一个自己的queue,默认使用**amq.topic交换器,**由mqtt-subscription-***-qos1组成queue名。其中qos概念自行了解。
2.AMQP连接消费也需要绑定到MQTT对应的交换器和队列中,其中routingKey则使用MQTT订阅主题。
上代码:
javascript
//****************************************************************** */
//MQTT
const mqtt = require("mqtt")
const client = mqtt.connect({
url: "mqtt://127.0.0.1:1883",
clientId: 'nickchen111', // 客户端ID,此ID可自定义。queue后缀
username: 'guest', // 用户名
password: 'guest'
}) // 连接到mqtt服务器
var quque = "device_aaa"
var quque_rpc = "device_aaa_rpc";
client.subscribe(quque_rpc, { qos: 1 })
var status = false;
var count = 0;
var error = 0;
setInterval(() => {
if (status) {
count += 1;
var msg = Math.ceil(Math.random() * 40)
console.log("MQTT发送消息:" + msg)
client.publish(quque, msg.toString(), { qos: 0, retain: true })
}
}, 3000);
client.on("message", function (top, message) {
if (top == "device_aaa") {
error += 1;
}
console.log("MQTT接收消息:" + top + " : " + message.toString() + "*******丢失返回消息共:[" + error + "]条")
if (JSON.parse(message.toString()).command == "stop") {
status = false;
}
if (JSON.parse(message.toString()).command == "start") {
status = true;
}
})
//****************************************************************** */
//AMQP
const amqp = require('amqplib');
async function consumer() {
// 创建链接对象
const connection = await amqp.connect('amqp://localhost:5672');
// 获取通道
const channel = await connection.createChannel();
// 声明参数
const exchangeName = 'amq.topic';
const queueName = 'mqtt-subscription-nickchen111qos1';
const routingKey = 'device_aaa';
// // 声明一个交换机
// await channel.assertExchange(exchangeName, 'amq.topic', { durable: true });//消息持久化
// // 声明一个队列
await channel.assertQueue(queueName, { autoDelete: true, durable: true });
// 绑定关系(队列、交换机、路由键)
await channel.bindQueue(queueName, exchangeName, routingKey);
var data = await channel.publish(exchangeName, "device_aaa_rpc", Buffer.from(JSON.stringify({ command: "start" })))
// 消费
await channel.consume(queueName, msg => {
console.log('Consumer:', msg.content.toString());
channel.ack(msg);
},{ noAck: false });//开启通知
console.log('消费端启动成功!');
}
consumer();