async function getAccessToken() {
  logger.debug('Loading Tuya access token...');
  const accessToken = await this.gladys.variable.getValue(GLADYS_VARIABLES.ACCESS_TOKEN, this.serviceId);
  logger.debug('Tuya access token well loaded');
  return accessToken;
}
@description Implements Tuya connector get access token method.
@returns {Promise} Tuya access token.
@example
await tuya.getAccessToken();
@see https://github.com/tuya/tuya-connector-nodejs#custom-tokenstore