struct dataLoad {
        QString text;
        QImage image;
    };

Sending it to the mqtt broker.

How can I read it from nodejs client as string and png ?

var mqtt = require('mqtt')
//var client  = mqtt.connect('mqtt://ps01.insightradar.com', username="murat" , password="murat1990" , clientId="nodeJS")
var client = mqtt.connect('mqtts://pxxs01mm.com', {
    username: 'admin',
    password: 'xx',
    rejectUnauthorized: false
});
client.on('connect', function () {
  client.subscribe('qtmqtt/topic1', function (err) {
    if (!err) {
      client.publish('result/light', 'Hello mqtt')
    }
  })
})

client.on('message', function (topic, message) {
  // message is Buffer
    
  console.log(message.toString())
  
})