socketIO for low level programming Board

[yash2020]

hi, i am try to connect the socketIO server v4 using Arduino and building library for socketIO at low level communication. but i did't find the work flow of client and server handshake and hard to connect to socketIO server using Arduino
boards list:
Arduino UNO + EthernetShield For ENC28J60 or W5100
Arduino + WifiShield For ESP8266 or ESP32

Following code to rebuilt:
#include "Arduino.h"

#if defined(W5100)
#include <Ethernet.h>
#include "SPI.h" //For W5100
#elif defined(ENC28J60)
#include <UIPEthernet.h>
#include "SPI.h" //For ENC28J60
#elif defined(ESP8266)
#include <ESP8266WiFi.h> //For ESP8266
#elif defined(ESP32)
#include <WiFi.h> //For ESP32
#elif (!defined(ESP32) && !defined(ESP8266) && !defined(W5100) && !defined(ENC28J60)) //If no interface is defined
#error "Please specify an interface such as W5100, ENC28J60, ESP8266 or ESP32"
#error "above your includes like so : #define ESP8266 "
#endif

// Length of static data buffers
#define DATA_BUFFER_LEN 120
#define SID_LEN 24

class SocketIOClient {
public:
bool connect(char hostname[], int port = 80, char query[] = "");
bool connectHTTP(char hostname[], int port = 80);
bool connected();
void disconnect();
bool reconnect(char hostname[], int port = 80, char query[] = "");
bool monitor();
void sendMessage(String message = "");
void send(String RID, String Rname, String Rcontent);
void sendNSP();
void sendJSON(String RID, String JSON);
void heartbeat(int select);
void clear();
void getREST(String path);
void postREST(String path, String type, String data);
void putREST(String path, String type, String data);
void deleteREST(String path);
private:
void parser(int index);
void sendHandshake(char hostname[], char query[] = "");
#if defined(W5100) || defined(ENC28J60)
EthernetClient client; //For ENC28J60 or W5100
#endif
#if defined(ESP8266) || defined(ESP32)
WiFiClient client; //For ESP8266 or ESP32
#endif

bool readHandshake();
void readLine();
char *dataptr;
char databuffer[DATA_BUFFER_LEN];
char sid[SID_LEN];
char key[28];
int pingInterval;
int pingTimeout;
char *upgrades;

char *hostname;
char *query;
char *nsp;
int port;

void findColon(char which);
void terminateCommand(void);
bool waitForInput(void);
void eatHeader(void);

};