aidex.js

var serial = "XX9999"; //<-- Put serial number to pair here
var device = "";

//now get advertised packets 
var dt;
function scanForDevices() {
  NRF.findDevices(function(devs) {
    devs.forEach(function(dev) {
      g.clear();

      dt = dev.manufacturerData;
      v = new DataView(new Uint8Array(dt,0,12).buffer);
      
      epoch=946684800-28800; //off by 8hrs
      timestamp = new Date((v.getUint32(2,true)+epoch)*1000); //Date [2-5]
      age = parseInt(dt[1] /6); //Sample age [1]

      sens_no = dt[8]; //Sensor count
      phase = dt[9]; //State?
      
/* Doesn't seem to start at zero on a new sensor after all.
if (state == 0) {
        console.log("Fresh sensor");
      } else if (state == 1) {
        console.log("Linking");
      } */
      
       // Running
        life = 300 * (v.getUint16(6,true)); //Age of sensor
        span = 15 - life / (60 * 60 * 24);
        
        unk = dt[11];    //unknown?
        glu = dt[10]/10; //gluc mmol
      mg = glu*18;

        if (phase == 4) { // countdown phase
          time = dt[10];
          console.log("Warming " + (59 - time) + " mins");
        }
        
          if (phase == 0xc) { // Stabilising
            run = "stabilizing";
          }
          console.log(dt);
          console.log("Date: " + timestamp.toISOString() +
                      " Days: " + parseInt(span) +
                      " Gluc: " + glu +
                      " Age: " + age);
      
          g.setFont("6x8:4").drawString(age+" min", 0,50);
          g.setFont("6x8:4").drawString(glu+" mmol",0,90);
          g.setFont("6x8:4").drawString(mg+" mg",0,130);
        
    });
  }, {timeout: 2000, //Check for a couple of seconds
     filters: [{id: device}]}); 
}

//Encode serial.
var ser = new Uint8Array([serial.charCodeAt(0)-55, //uppercase to 10 on
                          serial.charCodeAt(1)-55,
                          serial[2], //Numerals direct
                          serial[3],
                          serial[4],
                          serial[5]]);

NRF.setScan(function(d) {
  if (d.name == 'AiDEX') //Is it a transmitter
  {
    var sens = new Uint8Array(d.manufacturerData, 0, 6);
    if (sens == ser) // Find serial
    {
      device=d.id;
      console.log("Device is: "+ device);
      NRF.setScan(); //stop
      
      setInterval(scanForDevices, 60000);
      scanForDevices();
    }
  }
}, { active: true } );