Set PlayBulb Candle Color

The idea for my first Puck.js project is to use the puck a wall switch to control three BLE lamps (https://www.amazon.de/dp/B00PB4VXDS) i have. Based on some other code (https://codelabs.developers.google.com/codelabs/candle-bluetooth/index.html) this should be a simple task. So far i can connect, read the current color and set the name of the light. But setting the color doesn't work.

NRF.connect("bb:df:4b:17:ac:e6").then(function(gat) {
  console.log("Gat: " + gat);

  gat.getPrimaryService("0xFF02").then(function(service) {
    console.log("Service: " + service);

    service.getCharacteristic("0xFFFC").then(function(characteristic) {
      console.log(characteristic);

      //characteristic.readValue().then(data => {
      //  console.log(typeof data);
      //  console.log(data);
      //  console.log(JSON.stringify(data));
      //});

      characteristic.writeValue(new Uint8Array([0x00, 255, 0, 0])).then(function() {
        console.log("Hit!!!");
      }).catch(function() {
        console.log("4");
      });

    }).catch(function() {
      console.log("3");
    });

  }).catch(function() {
    console.log("2");
  });

}).catch(function() {
  console.log("1");
});

No catch block is called but the color of the light does not change. Im not really sure if new Uint8Array([0x00, 255, 0, 0]) is the write type here but 00FF0000 or \x00\xFF\x00\x00 does not work either. When i read the characteristic i get:

string
ÿ
"\x00\x18\x98\xFF"

I am thankful for any help or ideas.

You could try changing gat.getPrimaryService("0xFF02") to gat.getPrimaryService(0xFF02) (and the same for the characteristic too) - I'm not 100% sure but that might make some difference.

What you're doing with Uint8Array sounds fine, but then "\x00\xFF\x00\x00" or even just [0,255,0,0] should work as well.

And if you do the same from an app like nRF connect, you can change the light's colour?