Paho MQTT：可能存在导入错误？

Question

我最近paho-mqtt通过yarn下载了。问题是我不确定我是否正确导入它，因为我收到错误：

无法读取未定义的属性“Client”

我导入和使用它的方式是这样的：

import Paho from 'paho-mqtt'; 
var client = new Paho.MQTT.Client(location.host, location.port, location.clientID)

const MQTTConnectAndMessage = (message) => {
    client.connect({onSuccess: sendMQTTMessage})
}

const sendMQTTMessage = (msg) => {
    let message = new Paho.MQTT.Message(msg); 
    message.destinationName = location.messageDestination; 
    client.send(message); 
}

location.host = IP 字符串

location.port = 端口号

location.clientID = clientID 的字符串

如果相关，我将尝试在 React Native 应用程序中使用它。

也许这个模块不适合通过 NPM 或 Yarn 下载？或者也许我不应该导入“Paho”？

编辑：使用时react-native-paho-mqtt--这是我正在使用的代码：

const client = new Client({ uri: 'ws://myiphere/ws', port: 1883, clientId: 'clientId', storage: myStorage});

const sendMQTTMessage = (msg) => {
    client.on('connectionLost', (responseObject) => {
        if (responseObject.errorCode !== 0) {
          console.log("connection lost!");
        }
      });
      client.on('messageReceived', (message) => {
        console.log(message.payloadString);
      });

    client.connect()
        .then(() => {
            const message = new Message(msg);
            message.destinationName = 'F2/BOX2/LED3';
            client.send(message);
        })
        .catch((responseObject) => {
            if (responseObject.errorCode !== 0) {
             console.log('onConnectionLost:' + responseObject.errorMessage);
            }
        });
} 

export {
    sendMQTTMessage
}

我注意到，每当我输入任何不以 ws://（网络套接字）开头的内容时，我都会收到 URI 错误。

Answer 1

paho-mqtt库已更改，示例代码不正确

var client = new Paho.MQTT.Client(location.host, location.port, location.clientID)

应更改为（从对象路径中删除 MQTT）：

var client = new Paho.Client(location.host, location.port, location.clientID)

请参阅 GitHub 自述文件页面中的“重大更改”： paho.mqtt.javascript

Answer 2

尝试这个react-native兼容库：https://www.npmjs.com/package/react-native-paho-mqtt

yarn add react-native-paho-mqtt