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You may like to check Bluetooth guide: native ,  there is a procedure stated to find the address of the device bonded.

/* Server address for connecting */
char *bt_server_address = NULL;
const char *remote_server_name = "server device";
 
bool
adapter_bonded_device_cb(bt_device_info_s *device_info, void *user_data)
{
    if (device_info == NULL)
        return true;
    if (!strcmp(device_info->remote_name, (char*)user_data)) {
        dlog_print(DLOG_INFO, LOG_TAG, "The server device is found in bonded device list. address(%s)",
                   device_info->remote_address);
        bt_server_address = strdup(device_info->remote_address);
        /* If you want to stop iterating, you can return "false" */
    }
    /* Get information about bonded device */
    int count_of_bonded_device = 1;
    dlog_print(DLOG_INFO, LOG_TAG, "Get information about the bonded device(%d)", count_of_bonded_device);
    dlog_print(DLOG_INFO, LOG_TAG, "remote address = %s.", device_info->remote_address);
    dlog_print(DLOG_INFO, LOG_TAG, "remote name = %s.", device_info->remote_name);
    dlog_print(DLOG_INFO, LOG_TAG, "service count = %d.", device_info->service_count);
    dlog_print(DLOG_INFO, LOG_TAG, "bonded?? %d.", device_info->is_bonded);
    dlog_print(DLOG_INFO, LOG_TAG, "connected?? %d.", device_info->is_connected);
    dlog_print(DLOG_INFO, LOG_TAG, "authorized?? %d.", device_info->is_authorized);
 
    dlog_print(DLOG_INFO, LOG_TAG, "major_device_class %d.", device_info->bt_class.major_device_class);
    dlog_print(DLOG_INFO, LOG_TAG, "minor_device_class %d.", device_info->bt_class.minor_device_class);
    dlog_print(DLOG_INFO, LOG_TAG, "major_service_class_mask %d.", device_info->bt_class.major_service_class_mask);
    count_of_bonded_device++;

    /* Keep iterating */

    return true;
}

ret = bt_adapter_foreach_bonded_device(adapter_bonded_device_cb, remote_server_name);
if (ret != BT_ERROR_NONE)
    dlog_print(DLOG_ERROR, LOG_TAG, "[bt_adapter_foreach_bonded_device] failed!");

if (bt_server_address != NULL)
    free(bt_server_address);