ESP32 arduino dev kit BLE max speed

[oaktree042]

Hello! I'm doing my internship and I'm totally a novice in the themes of Arduino, ESP32 and C++. The main task is to send data from one ESP32 to another ESP32 on maximum possible speed (data throughput). During my research I have found that theoretically BLE can achieve speed up to 1 Mbit/s. But with my server and client programs can achieve only 4.6 kbit/s without MTU setup and 5.6 kbit/s with MTU = 517.

Main question: Is it possible to achieve more speed with my equipment setup? I know that the BLE standard is not suitable for high speed data transfer, but my main task is to find the actual max data transfer speed.

I’m using two ESP32_Devkit_V4 and Arduino IDE 2.0.3. External antennas and range between them less 0.15 - 0.2 m. Using some different examples from the internet I have built client and server programs. Server is sending data to the client.
I used libraries:

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1. #include <BLEDevice.h>
2. #include <BLEServer.h>
3. #include <BLEUtils.h>
4. #include <BLE2902.h>

GeSHi © Codebox Plus Extension

I set up the delay between messages = 90 ms

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1. delay(90)

GeSHi © Codebox Plus Extension

Every message length is 512 bits, for example the first one is:

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1.  
2. valuesend= "(111111)(beight)(beight)(beight)(beight)(beight)(beight)(beight)";
3. customCharacteristic.setValue(valuesend.c_str());
4.  

GeSHi © Codebox Plus Extension

If I make the message length more than 512 bits I will lose some messages in the receiver part. If I set up a delay between messages less than 90 ms, I will lose some messages too.
I attached my client and server programs here in txt files.

Thank you for your replies, Gleb.