Slower Data Rate with Larger Packet Size using TCP - ESP32

Using Arduino Networking, Protocols, and Devices
1

Hope you are having a good day,

I am trying to maximise data rate over TCP from esp32 client to server on PC.
When I increase the packet size (by changing numOfTs from 32 to 64), the server receives the data slower.

Here is my code:

#include <WiFi.h>

/* WiFi network name and password */
const char * ssid = "WiFi Guest_";
const char * pwd = "";

/* Ip address of server (PC) and udp port - same as python script */
const char * hostIP = "192.168.10.57";
const int port = 1234;

unsigned short* buff;

// number of adc channels and number of timesteps sent with one packet
int numOfCh = 8;
int numOfTs = 64;

int adcSample1 = 0b1111111111111110;

WiFiClient client;

void setup()
{
    Serial.begin(115200);
    Serial.print("Connecting to ");
    Serial.println(ssid);
    /* connect to your WiFi */
    WiFi.begin(ssid, pwd);
    /* wait until ESP32 connect to WiFi*/
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    Serial.println("");
    Serial.println("WiFi connected with IP address: ");
    Serial.println(WiFi.localIP());
    buff = reinterpret_cast<unsigned short*>(malloc((numOfCh+2) * (numOfTs) * sizeof(short)));
}

void loop()
{
  for(int ts = 0; ts<numOfTs; ts++){
    for(int ch = 0; ch<(numOfCh); ch++){
      if(ch == 0){
        *(buff+(ts*(numOfCh+2))) = adcSample1;                                      // 0b10101010101010101010101010101010;  
        *(long*)(buff+(8 + (ts*(numOfCh+2)))) = 0b10101010101010101010101010101010; // 0b11111111111111111111111111111110;
      }
      else{
        *(buff+(ch + (ts*(numOfCh+2)))) = adcSample1;
      }
    }
      
  }

  sendTCP(buff);
  
}

void sendTCP(unsigned short *packet){

 while (!client.connect(hostIP, port)){
    client.connect(hostIP, port);
 }
 client.write((uint8_t*)packet, (sizeof(short) * (numOfCh+2) * (numOfTs)));
  
}

Am I using sendTCP() correctly? Is there a better way of using WiFiClient? Do I need to run client.connect() each time I send a packet? Using client.connected() ocassionally gives a rogue packet of a very large length.

Thanks in advance for your suggestions,
Will

2

Bypassing the Arduino ESP32 core may gain a bit more speed with processing. The ESP32's networking API's.

3

Are you sure that code is correct, seems strange to call the same routine multiple times, should you be using client.connected() for the first call?

4

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