in sensor/index.js [41:53]
setInterval(function(){
msg.value = 75 + Math.floor((Math.random() * (10 - 1) + 1));
msg.timestamp = new Date().getTime();
var topic = VALUE_TOPIC.replace('[thingName]', settings.clientId);
device.publish(topic, JSON.stringify(msg));
console.log('published to topic ' + topic + ' ' + JSON.stringify(msg));
}, VALUE_RATE);