I used BLUENRG IC with firmware version 4.6b mode 2. To control this IS I used MCU STM32f407VGT. For comminication each other I used HCI protocol. Data transfer between the client and BLUENRG server occured by the following scenario: client requests for reading data from characteristic and MCU call function aci_gatt_update_char_value. This scenario works correctly for low data rate (delay between request approximately 200 ms). When data rate is high (delay ~20 ms) after (~20000) timeout of update characteristic apperes.Do you have any idea why timeout appears? In my opinion this problem is overflow buffer in the RAM of BLUENRG module. How to solve this problem?