const mqtt = require('mqtt');

const PUB_TOPIC = "test-sub";
const MESSAGE = "Message from server";

const options = {
  clientId: 'test_device2',
  username: 'test_user',
  password: 'test_pass',
};

const client = mqtt.connect('mqtt://localhost:1883', options);

client.on('connect', function () {
  console.log('Connected to MQTT broker');
  setInterval(function () {
    client.publish(PUB_TOPIC, MESSAGE);
    console.log(`Published: ${MESSAGE} to ${PUB_TOPIC}`);
  }, 10000);  // 30秒ごとにパブリッシュ
});

client.on('error', function (err) {
  console.error('MQTT client error:', err);
});