How to call Random Static Address in the past

[ELEHM]

Hello, 

I am developing a BLE HID device using the STM32WB55.

I am generating random static addresses using a program implemented in the STM32CubeWB. This is used to identify multiple peripherals with the same functionality.

#else
  /* Get RNG semaphore */
  while(LL_HSEM_1StepLock(HSEM, CFG_HW_RNG_SEMID));

  /* Enable RNG */
  __HAL_RNG_ENABLE(&hrng);

  /* Enable HSI48 oscillator */
  LL_RCC_HSI48_Enable();
  /* Wait until HSI48 is ready */
  while(! LL_RCC_HSI48_IsReady());

  if (HAL_RNG_GenerateRandomNumber(&hrng, &a_srd_bd_addr[1]) != HAL_OK)
  {
    /* Random number generation error */
    Error_Handler();
  }
  if (HAL_RNG_GenerateRandomNumber(&hrng, &a_srd_bd_addr[0]) != HAL_OK)
  {
    /* Random number generation error */
    Error_Handler();
  }
  a_srd_bd_addr[1] |= 0xC000; /* The two upper bits shall be set to 1 */

  /* Disable HSI48 oscillator */
  LL_RCC_HSI48_Disable();

  /* Disable RNG */
  __HAL_RNG_DISABLE(&hrng);

  /* Release RNG semaphore */
  LL_HSEM_ReleaseLock(HSEM, CFG_HW_RNG_SEMID, 0);
#endif /* CFG_STATIC_RANDOM_ADDRESS */


#if (CFG_BLE_ADDRESS_TYPE != GAP_PUBLIC_ADDR)
  ret = aci_hal_write_config_data(CONFIG_DATA_RANDOM_ADDRESS_OFFSET, CONFIG_DATA_RANDOM_ADDRESS_LEN, (uint8_t*)a_srd_bd_addr);
  if (ret != BLE_STATUS_SUCCESS)
  {
    APP_DBG_MSG("  Fail   : aci_hal_write_config_data command - CONFIG_DATA_RANDOM_ADDRESS_OFFSET, result: 0x%x \n", ret);
  }
  else
  {
    APP_DBG_MSG("  Success: aci_hal_write_config_data command - CONFIG_DATA_RANDOM_ADDRESS_OFFSET\n");
    APP_DBG_MSG("  Random Bluetooth Address: %02x:%02x:%02x:%02x:%02x:%02x\n", (uint8_t)(a_srd_bd_addr[1] >> 8),
                                                                               (uint8_t)(a_srd_bd_addr[1]),
                                                                               (uint8_t)(a_srd_bd_addr[0] >> 24),
                                                                               (uint8_t)(a_srd_bd_addr[0] >> 16),
                                                                               (uint8_t)(a_srd_bd_addr[0] >> 8),
                                                                               (uint8_t)(a_srd_bd_addr[0]));
  }
#endif /* CFG_BLE_ADDRESS_TYPE != GAP_PUBLIC_ADDR */

Is there any way to restore the address generated here after a reset?

This is to perform a reconnection of the coupled device using ADV_DIRECT_IND with the restored random address.

I thought of saving it to NVM as a method, is it possible?

I would appreciate if you could answer me.

Best regards.