ESP32 Forum

Posted: **Thu Jan 12, 2023 1:33 pm**

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:

Code: [Select all] [Expand/Collapse]

#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>

GeSHi © Codebox Plus Extension

I set up the delay between messages = 90 ms

Code: [Select all] [Expand/Collapse]

delay(90)

GeSHi © Codebox Plus Extension

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

Code: [Select all] [Expand/Collapse]

 
valuesend= "(111111)(beight)(beight)(beight)(beight)(beight)(beight)(beight)";
customCharacteristic.setValue(valuesend.c_str());

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.

ESP32 Forum

ESP32 arduino dev kit BLE max speed

ESP32 arduino dev kit BLE max speed