async function newPinCode() {
  const rd = () => Math.floor(Math.random() * 10);
  const pincode = `${rd()}${rd()}${rd()}-${rd()}${rd()}-${rd()}${rd()}${rd()}`;

  await this.gladys.variable.setValue('HOMEKIT_PIN_CODE', pincode, this.serviceId);

  return pincode;
}
@description Generate new pincode.
@returns {Promise} Resolving with new pin code.
@example
newPinCode()