var mqtt = require('mqtt');
var client  = mqtt.connect(
  'mqtt://eu1.cloud.thethings.network:1883', {
     rejectUnauthorized:false,
     username:'<myuser>',
     password:'<mytoken>',
     connectTimeout:5000
   }
);

client.on('connect', function () {
  client.subscribe('#', function (err) {
    if (!err) {
      console.log('subscribed');
    }
  })
})

client.on('message', function (topic, message) {
  var json=JSON.parse(message.toString());
  console.log(json.uplink_message.received_at,json.end_device_ids.dev_addr,json.uplink_message.frm_payload);
})