async function getConfiguration() {
  const mqttUrl = await this.gladys.variable.getValue(CONFIGURATION.ZWAVEJS_UI_MQTT_URL_KEY, this.serviceId);
  const mqttUsername = await this.gladys.variable.getValue(CONFIGURATION.ZWAVEJS_UI_MQTT_USERNAME_KEY, this.serviceId);
  const mqttPassword = await this.gladys.variable.getValue(CONFIGURATION.ZWAVEJS_UI_MQTT_PASSWORD_KEY, this.serviceId);
  return {
    mqtt_url: mqttUrl,
    mqtt_username: mqttUsername,
    mqtt_password: mqttPassword,
  };
}
@description This will return the current configuration.
@returns {Promise<object>} Resolve with configuration.
@example zwaveJSUI.getConfiguration();