nceu2018-blescan.js

// Node.js
var bleno = require('bleno');


var MSG = {
  LED_COLOR: 1,
  MSG_NEXT: 2,
  MSG_NOW: 3,
  MSG_ALERT: 4,
  MSG_INFO: 5
}

var messages = [
  [ MSG.LED_COLOR, "\0\0\0" ],
  [ MSG.MSG_NEXT, "Mr. Flibbles"],
  [ MSG.MSG_NOW, "Someone interesting"]
];
var msgIndex = 0;

function setAdvert(msgType, msgText) {
  var piData = [4+msgText.length,0xFF,0x90,0x05,msgType];
  for (var i=0;i<msgText.length;i++) piData.push(msgText.charCodeAt(i));
  var advertisementData = new Buffer(piData.length);
  for (var i=0;i<piData.length;i++) advertisementData.writeUInt8(piData[i], i);
  bleno.startAdvertisingWithEIRData(advertisementData, function(err) {
    if (err) console.log("startAdvertising",err);
  });
}


function swapAdvertising() {
  msgIndex++;
  if (msgIndex>=messages.length) msgIndex=0;
  if (messages[msgIndex])
    bleno.stopAdvertising(function() {
      setAdvert(messages[msgIndex][0], messages[msgIndex][1]);
    });
}

function startAdvertising() {
  console.log("Starting advertising");
  setInterval(swapAdvertising, 110);
}


bleno.on('stateChange', function(state) {
  console.log("STATE => "+state);
  if (state=="poweredOn") 
    startAdvertising();
});

// Espruino
var MSG = {
  RESERVED : 0,
  LED_COLOR: 1,
  MSG_NEXT: 2,
  MSG_NOW: 3,
  MSG_ALERT: 4,
  MSG_INFO: 5
};
var whitelist = [
  "b8:27:eb:31:6f:66 public",
];


var bleData = [];
function gotData(msg,v) {
  console.log(Object.keys(MSG)[msg]+" => "+JSON.stringify(v));
}

function doScan() {
  var d = [];
  packets = 0;
  setTimeout(function() {
    NRF.setScan();
    console.log(packets+" received");
    for (var k in d) {
      if (bleData[k]!=d[k]) {
        bleData[k] = d[k];
        gotData(k,d[k]);
      }

    }
  }, 1000);
  console.log("Scanning");
  NRF.setScan(function(device) {
    var m = device.manufacturerData;
    if (whitelist.indexOf(device.id)<0 || !m) return;
    packets++;
    d[m[0]] = E.toString(new Uint8Array(m,1));
  }, { filters: [{ manufacturerData:{0x0590:{}} }] });
}

setInterval(doScan, 60000);