code: function formatUuid(Uuid) {
  	var formatted='';
  	//expand short service/characteristic UUID
  	if (Uuid.length == 4) {
  		formatted='0000' + Uuid + '-0000-1000-8000-00805f9b34fb';
  	}
  	else { //just add dashes 
  		formatted = Uuid.slice(0,8)+'-'+Uuid.slice(8,12)+'-'+Uuid.slice(12,16)+'-'+Uuid.slice(16,20)+'-'+Uuid.slice(20,32);
  	}
  	return formatted;
  }
docs: nrf requires strict UUID format