Trying to get an example working with my device...

So, then I tried the compact example shown below. There is a pause, then the WEB IDE shows "Disconnected". Note: I'm using 1v92.21.

var gatt;
NRF.requestDevice({ timeout:2000, filters: [{ services: '0xbbc21523-008e-fe6b-28ee-d6a44f9cb5da' }]}).then(
  device => device.gatt.connect()).then(
  g => (gatt=g).getPrimaryService("0xbbc21523-008e-fe6b-28ee-d6a44f9cb5da")).then(
  service => service.getCharacteristic("0xbbc21525-008e-fe6b-28ee-d6a44f9cb5da")).then(
  characteristic => characteristic.writeValue(oxff)).then(
  () => { gatt.disconnect(); console.log("Done!"); } );