ble-example.md

Bluetooth Low Energy example

This is the example from our early look video, in here we are using Bluetooth LE to interact with the LiFx light bulb based on their proximity.

The Silk program's code goes like this:

'use strict';

const log = require('silk-alog');
log.info('hello world');

/////////////////////////////////////////

const lifxApi = require('node-lifx');
let light = null;
let lifx = new lifxApi.Client();
lifx.init();

lifx.on('light-new', newLight => {
  log.info(`Found Lifx light ${newLight.id}`);
  light = newLight;
  setLight(30);
});

function setLight(brightness) {
  if (light) {
    light.on();
    light.color(190, 88, brightness);
  }
}

////////////////////////////////////////////////

const noble = require('noble');
noble.on('stateChange', state => {
  if (state === 'poweredOn') {
    noble.startScanning([], true);
  }
});

noble.on('discover', peripheral => {
  let name = peripheral.advertisement.localName;
  if (name === 'myAdvertisement') {
    log.info(`discovered ${name} rssi: ${peripheral.rssi}`);
    setLight(peripheral.rssi + 100);
  }
});

And on the computer, an advertise.js should look like this:

var bleno = require('bleno');

bleno.on('stateChange', state => {
  if (state === 'poweredOn') {
    bleno.startAdvertising('myAdvertisement', ['ffff']);
  }
});