this.subscribeMultiple =function (filter, subscribeOptions) { client.subscribeMultiple(filter, subscribeOptions); }; 使用说明: 修改后的底层js文件,导入源文件,替换以前使用的即可 使用本人再次封装的mqtt.js https://www.cnblogs.com/yangfengwu/p/11832651.html先看下这一节 调用: var TopicMultiple = ["...
As abreaking change, by default a error handler is built into the MQTT.js client, so if any errors are emitted and the user has not created an event handler on the client for errors, the client will not break as a result of unhandled errors. Additionally, typical TLS errors likeECONNRE...
一,直接用 paho-mqtt.js 订阅的主题 1111 消息等级 0 代码语言:javascript 复制 client.subscribeMultiple("1111",{qos:0,invocationContext:{arg:null},onSuccess:function(){console.log("订阅成功");},onFailure:function(){console.log("订阅失败");}}); 二,用 mqtt.js MQTT.subscribeTopicMultiple("1111...
1.MQTT.js MQTT.js is a widely-used MQTT client library for JavaScript, designed to run in both browser and Node.js environments. It provides a simple and reliable way to connect to MQTT brokers and publish/subscribe to MQTT topics.
MQTT.js是一个用于在JavaScript中实现MQTT协议的库。subscribe()函数是MQTT.js库中用于订阅主题的函数。当订阅的主题有新消息到达时,subscribe()函数会调用一个回调函数来处理这些消息。 在回调函数中,如果出现未捕获的错误消息,可能会导致程序崩溃或产生意外行为。为了避免这种情况,我们可以在回调函数中使用try-catch...
Subscribe to a topic or topicstopic is a String topic to subscribe to or an Array of topics to subscribe to. It can also be an object, it has as object keys the topic name and as value the QoS, like {'test1': {qos: 0}, 'test2': {qos: 1}}. MQTT topic wildcard characters ...
79 ```js 80 var mqtt = require('mqtt') 81 var client = mqtt.connect('mqtt://test.mosquitto.org') 82 83 client.on('connect', function () { 84 client.subscribe('presence', function (err) { 85 if (!err) { 86 client.publish('presence', 'Hello mqtt') ...
Event: 'subscribe' function(packet) {} Emitted when a MQTT subscribe packet is received. packetis an object that may contain the properties: messageId: the ID of the packet properties: properties of packet subscriptions: an array of objects representing the subscribed topics, containing the follow...
topicis aStringtopic to subscribe to or anArrayof topics to subscribe to. It can also be an object, it has as object keys the topic name and as value the QoS, like{'test1': {qos: 0}, 'test2': {qos: 1}}. MQTTtopicwildcard characters are supported (+- for single level and#- ...
Can add multiple topics by repeated use of-t option Use-v noto display only changed messages Use-c 100to stop after 100 seconds Use-q value (0 or 1 or 2)to set the QOS of all topics Use-d yesto turn on debugging mode The script is designed to be run from the command line. ...