TCP/IP communication between few ESP32 - memory crash with client.remoteIP()

Hello everyone!

I am trying to find solution to my problem for few days but i almost gave up…

i try to set up communication via TCP/IP between few ESP32 modules, (1 is server and rest are clients sending data). I did it succesfully but when i try to recognize each ESP32 by IP (by calling client.remoteIP()) i got memory crash like this:
Guru Meditation Error: Core 0 panic’ed (InstrFetchProhibited). Exception was unhandled.
Core 0 register dump:
PC : 0x00000000 PS : 0x00060e30 A0 : 0x801100ad A1 : 0x3ffb3d30
A2 : 0x3ffccd7c A3 : 0x3ffccfb0 A4 : 0x3ffcb340 A5 : 0x3ffcb320
A6 : 0x0204a8c0 A7 : 0x0c04a8c0 A8 : 0x8010ff50 A9 : 0x3ffb3cf0
A10 : 0x3ffccd8c A11 : 0x3ffccfb0 A12 : 0x3ffb3d3c A13 : 0x00000044
A14 : 0x00000001 A15 : 0x00000006 SAR : 0x00000010 EXCCAUSE: 0x00000014
EXCVADDR: 0x00000000 LBEG : 0x4000c349 LEND : 0x4000c36b LCOUNT : 0x00000000

Backtrace: 0x00000000:0x3ffb3d30 0x401100aa:0x3ffb3d70 0x4011d011:0x3ffb3d90 0x40122019:0x3ffb3dd0 0x401272b6:0x3ffb3df0 0x401109cf:0x3ffb3e10 0x40088b7d:0x3ffb3e40

Like i said if i dont call for client.remoteIP function i am able to send data - but i need this to recognize every ESP and sord received data properly
When i call client.remoteIP() only once it works properly (but not always, sometimes i need to restart clients few times to stabilize)

I attach code for server:

#include <WiFi.h>

WiFiServer server(80);                // Set a object server as a WiFiServer class
IPAddress IP(192,168,4,1);           // Select ip and mask
IPAddress mask = (255, 255, 255, 0);

void setup() { 
  WiFi.mode(WIFI_AP);                     // Set Wi-Fi as access point/server
  WiFi.softAP("ESP32", "123456789");                // SSID and Password for the AP
  WiFi.softAPConfig(IP, IP, mask);        // Set our own desired IP address
  server.begin();  // Begin the server

  Serial.println("Server started.");
  Serial.print("IP: ");    
  Serial.println(WiFi.softAPIP());        // .softAPIP calls for the IP of the access point which we set earlier
  Serial.println(WiFi.softAPmacAddress());  // Calls for the mac address

void loop() { 
  WiFiClient client = server.available(); // Return a client object to the class if there is a client available
  if (!client) {return;}    // Return cuts the function (loop) if client class is not connected

//  String request = client.readStringUntil('\r');    // Reads string received until \r and saves as string
//  Serial.print("From ");
//  Serial.print(client.remoteIP());
//  Serial.print(", port ");
//  Serial.println(client.remotePort());
  if (client.remoteIP()[3] == 2){ // check the last byte of IP adress to check which esp connected
  String request = client.readStringUntil('\r');
  Serial.println(" Dostalem po TCP od 1 : " + request);                                
  client.println(" Dostalem po TCP: " + request + "\r");   // Send the data with the \r so the client knows when to stop

    if (client.remoteIP()[3] == 3){
  String request = client.readStringUntil('\r');
  Serial.println(" Dostalem po TCP od 2 : " + request);                                
  client.println(" Dostalem po TCP: " + request + "\r");   // Send the data with the \r so the client knows when to stop

and code for client:

include <WiFi.h>

IPAddress ip(192, 168, 4, 1);
const char* host = "";  
const uint16_t port = 80;        
int buffer;      
int sygnal[100];  /

void setup()
  WiFi.begin("ESP32", "123456789");
  while (WiFi.status() != WL_CONNECTED)
  Serial.print("Connected, IP address: ");
  for (int i=0; i <100; i++){   
void loop() {
  Serial.print("connecting to ");

  for (int i=0; i <100; i++){  //send 100 times
  // Use WiFiClient class to create TCP connections
    WiFiClient client;
    if (!client.connect(host, port)) {
      Serial.println("connection failed");
      Serial.println("wait 3 sec...");
    // send buffer to server
  Serial.print("Wyslalem po TCP: ");
  //odczytaj odpowiedz serwera
  Serial.print("Odpowiedz: ");
  String line = client.readStringUntil('\r');
  Serial.println("closing connection");
//5 seconds delay
  Serial.println("wait 5 sec...");

Maybe there is any working example of communications like this - with many ESP32, or maybe someone can give me a tip how to deal with it