AWOX smart bulb tutorial - NRF ERROR 0x8 at ?:0

It seems you're doing:

try {
 ...
} catch (e) {
  ..
}

but what you need to do to catch promises (like the one in setLight) is:

....then(function() {
  // .....
}).catch(function(error) {
   // here
});

So not the usual try...catch - it's a bit weird, but it's just the way you have to handle stuff with JS promises.

While you can catch other errors, unfortunately that NRF Error won't be catchable - it's right from the lower levels of the hardware.

To me, it looks like you're not doing any checks to see whether you're in the middle of doing something with Bluetooth - so quite likely what'll happen is it'll turn on the light, get too bright, and try and turn itself off - which could happen while Puck.js is trying to disconnect, which could really mess things up?

Could you try replacing setLight with this?

var isBusy = false;
function setLight(isOn) {
  var gatt;
  if (isBusy) throw new Error("Busy!");
  isBusy = true;
  NRF.connect("98:7b:f3:67:75:33").then(function(g) {
    gatt = g;
    return gatt.getPrimaryService("33160fb9-5b27-4e70-b0f8-ff411e3ae078");
  }).then(function(service) {
    return service.getCharacteristic("217887f8-0af2-4002-9c05-24c9ecf71600");
  }).then(function(characteristic) {
    characteristic.writeValue(isOn);
  }).then(function(){
    gatt.disconnect();
    console.log("Done!");
    isBusy = false;
  }).catch(function(e) {
    console.log("Problem: "+e);
    if (gatt) gatt.disconnect();
    isBusy = false;
  });
}

It might help, as it'll refuse to do anything else if it's already in the middle of controlling the light.