pixl_temperature_display.js

require("Font8x12").add(Graphics);

// List of devices
var devices = [];

// For each device discovered
function onDevice(dev) {
  // work out the temperature
  var info = {
    id : dev.id.substr(0,17),
    temp : new DataView(dev.serviceData["1809"]).getInt16(0,true)/100
  };
  // save the info in 'devices' list
  var idx = devices.findIndex(d=>d.id == info.id);
  if (idx>=0) devices[idx] = info;
  else {
    devices.push(info);
    // Crop to 5 devices here?
  }
}
// Scan for devices
NRF.setScan(onDevice, { filters: [{ serviceData:{"1809":{}} }] });

// Display on screen
function show() {
  if (!devices.length)
    E.showMessage("No devices found");
  g.clear(1);
  devices.forEach(function(info, idx) {
    var y = idx*12;
    g.setFont("4x6");
    g.drawString(info.id, 0, y+4);
    g.setFont("8x12");
    g.drawString(info.temp, 90, y);
  });
  g.flip();
}

show();
setInterval(show, 1000);