我正在执行一种方法,其工作方式如下:当我按下一个按钮时,我想要不断地从订阅的主题中获取消息,当我按下另一个按钮时,我想要关闭连接并且不再接收任何消息。我认为连接已正确关闭,因为执行了client.on('close')事件,但是我继续从该主题接收消息。我该怎么办才能不再收到任何消息?
startStop
是布尔值,当我想接收消息时为true,而当我想停止接收消息时为false。我在做什么错?
这是我的代码:
mqttClientSubscribeToTraceability(reguladorId, startStop) {
const tls = (Meteor.settings.mqttConfigClient.mqtt.port === 8883) || Meteor.settings.mqttConfigClient.mqtt.ca;
const client = mqtt.connect(`${tls ? 'mqtts' : 'mqtt'}://${Meteor.settings.mqttConfigClient.mqtt.host}:${Meteor.settings.mqttConfigClient.mqtt.port}`,
{ keyPath: Meteor.settings.mqttConfigClient.mqtt.key,
certPath: Meteor.settings.mqttConfigClient.mqtt.cert,
ca: [Meteor.settings.mqttConfigClient.mqtt.ca],
rejectUnauthorized: false
});
const topic = `in/1.0/trafficLights/${global.region}/${reguladorId}`;
const json = {};
if (startStop) {
client.on('connect', () => {
client.subscribe(topic);
});
client.on('message', (topic, message) => {
const msg = JSON.parse(message);
console.log('msg', msg);
});
} else {
client.end();
client.on('close', () => {
client.unsubscribe(topic);
});
}
}
问题是,您每次调用该函数时都在创建连接对象,而没有对其进行持久引用。