require("FontTeletext5x9Ascii").add(Graphics);
require("FontHaxorNarrow7x17").add(Graphics);

function scanForDevices() {
  NRF.findDevices(function(devs) {
    g.clear();
    var idx = 0;
    devs.forEach(function(dev) {
      if ("services" in dev && dev.services.includes("feaa")) {
        g.setFont("Teletext5x9Ascii");
        g.drawString(`${dev.id.substring(12,14).toUpperCase()}${dev.id.substring(15,17).toUpperCase()}`,2,idx*20+10);
        g.setFont("Teletext5x9Ascii");
        g.drawString(`FEAA`,2,idx*20+2);
        g.setFont("HaxorNarrow7x17");
        var arr = dev.serviceData.feaa;
        var str = String.fromCharCode(arr[2],arr[3],arr[4],arr[5],arr[6],arr[7],arr[8],arr[9],arr[10],arr[11],arr[12],arr[13],arr[14],arr[15],arr[16],arr[17]);
        g.drawString(str,25,idx*20+1);
        idx++;
      }
    });
    if (!idx) {
      g.clear();
      g.flip();
      Pixl.setLCDPower(false);
      LED1.reset();
    } else {
      Pixl.setLCDPower(true);
      LED1.set();
      g.flip();
    }
  }, 1900); // scan for 1 sec
}

setInterval(scanForDevices, 2000);
scanForDevices();