Are values populated when creating attribute table just initail value?

[JoonDong]

I tried write to characteristic using esp_ble_gatts_set_attr_value() when ESP_GATTS_WRITE_EVT event received from nRF connect application.
But the arrays when creating attribute table(for example, 'heart_ctrl_point' array in the gatt_security_server example) are not changed when I checked using ESP_LOGI().
Also I tested using esp_ble_gatts_get_attr_value(), but strange value appear like 25 24 of ff, ff I did not expect.
how is attribute table managed??