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在vue中使用MQTT

最近有个需求，需要前端直接链接mqtt，想到后面可能多出使用，就封装成了hooks

中间遇到了一个坑，就是浏览器默认不支持mqtt协议，其借助了webSocket实现的mqtt协议，
而mqtt默认未开启webSocket官网中并说明，但其demo中都是使用的ws，最后通过不断的摸索确认是
需要在配置中进行相关配置

安装mqtt插件

pnpm add mqtt

or

npm i mqtt

or

yarn add mqtt

导入mqtt

import * as mqtt from "mqtt/dist/mqtt.min"

封装

这个封装只需要稍加改动就能在react中使用

import * as mqtt from "mqtt/dist/mqtt.min";
import {onUnmounted, reactive, ref} from "vue";export default function useMqtt(options, getMessage) {const data = ref();const connection = reactive({protocol: options.host ?? 'ws',host: options.host ?? '81.69.203.93',port: options.port ?? 8083,clientId: options.clientId ?? "mqttx_" + Math.random().toString(16).substring(2, 8),username: options.username ?? 'bduser',password: options.password ?? '123456',clean: options.clean ?? true,connectTimeout: options.connectTimeout ?? 30 * 1000, // msreconnectPeriod: options.reconnectPeriod ?? 4000 // ms});/*** 订阅信息设置*/const subscription = ref({topic: options.subscription.topic, //需要动态配置qos: options.subscription.qos});let client = ref({connected: false});const receivedMessages = ref("");const subscribedSuccess = ref(false);const btnLoadingType = ref("");const retryTimes = ref(0);/*** 初始化*/const initData = () => {client.value = {connected: false};retryTimes.value = 0;btnLoadingType.value = "";subscribedSuccess.value = false;};const handleOnReConnect = () => {console.log(`第${retryTimes.value}次重试`);retryTimes.value += 1;if (retryTimes.value > 5) {try {client.value.end();initData();} catch (error) {console.error(error)}}};/*** 创建连接*/const createConnection = () => {try {btnLoadingType.value = "connect";console.log('connection----->', connection)const {protocol, host, port, ...options} = connection;const connectUrl = `${protocol}://${host}:${port}/mqtt`;client.value = mqtt.connect(connectUrl, options);if (client.value.on) {client.value.on("connect", () => {btnLoadingType.value = "";console.log("------链接建立成功------");});client.value.on("reconnect", handleOnReConnect);client.value.on("error", (error) => {console.error("------链接建立失败------", error)});client.value.on("message", (topic, message) => {receivedMessages.value = receivedMessages.value.concat(message.toString());data.value = JSON.parse(message);if (getMessage) getMessage(message);console.log("收到的数据--------------", data.value);});}} catch (error) {btnLoadingType.value = "";console.error("链接出错", error);}};/*** 订阅消息*/const doSubscribe = () => {btnLoadingType.value = "subscribe";const {topic, qos} = subscription.value;console.log("订阅消息------->", `$queue${topic}`, qos);client.value.subscribe(`$queue${topic}`, {qos}, (error, granted) => {btnLoadingType.value = "";if (error) {console.log("subscribe error:", error);return;}subscribedSuccess.value = true;console.log("subscribe successfully:", granted);});};/*** 关闭连接*/const destroyConnection = () => {if (client.value.connected) {btnLoadingType.value = "disconnect";try {client.value.end(false, () => {initData();console.log("disconnected successfully");});} catch (error) {btnLoadingType.value = "";console.log("disconnect error:", error);}}};/*** 发送消息* @param data*/const publishMessage = (data) => {btnLoadingType.value = "publish";const {topic, qos} = subscription.valueconsole.log(`发送消息到【${topic}】-【${qos}】`)client.value.publish(`${topic}`, data, {qos}, (error) => {btnLoadingType.value = "";if (error) {console.error("消息发送失败", error);return;}console.log(`消息内容${data}`);});};/*** 取消订阅*/const doUnSubscribe = () => {btnLoadingType.value = "unsubscribe";const {topic, qos} = subscription.value;console.warn("取消订阅------->", `$queue${topic}`, qos);client.value.unsubscribe(`$queue${topic}`, {qos}, (error) => {btnLoadingType.value = "";subscribedSuccess.value = false;if (error) {console.log("unsubscribe error:", error);return;}console.log(`unsubscribed topic: ${topic}`);});};/*** 创建连接并订阅*/const createAndDo = () => {createConnection();doSubscribe();}// //组件销毁前断开连接onUnmounted(() => {console.log("------页面销毁前断开连接------");destroyConnection();});return {data,publishMessage,connection,subscription,doUnSubscribe,destroyConnection,createConnection,doSubscribe,createAndDo};
}