wpa2-enterprise-esp8266.ino

#include  <ESP8266WiFi.h>
#include <ArduinoWebsockets.h>

// include wpa2 enterprise code
extern "C" {
  #include "user_interface.h"
  #include "wpa2_enterprise.h"
}

// SSID, Username and password. Update with yours!

static const char* ssid = "ssid";
static const char* username = "username"; // 
static const char* password = "password";

using namespace websockets;
WebsocketsClient client;
const char* websockets_server_host = "xxx.xxx.xxx.xxx"; //Enter websocket server adress
const uint16_t websockets_server_port = 80; //for node-red use 1880


void setup() {

  Serial.begin(115200);
  delay(1000);

  // Setting ESP into STATION mode only (no AP mode or dual mode)
  wifi_set_opmode(STATION_MODE);

  struct station_config wifi_config;

  memset(&wifi_config, 0, sizeof(wifi_config));
  strcpy((char*)wifi_config.ssid, ssid);

  wifi_station_set_config(&wifi_config);
  
  // Clean up to be sure no old data is still inside
  wifi_station_clear_cert_key();
  wifi_station_clear_enterprise_ca_cert();

  wifi_station_set_wpa2_enterprise_auth(1);

  
  wifi_station_set_enterprise_username((uint8*)username, strlen(username));
  wifi_station_set_enterprise_identity((uint8*)username, strlen(username));
  wifi_station_set_enterprise_password((uint8*)password, strlen(password));
  
  wifi_station_connect();
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }

  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

   bool connected = client.connect(websockets_server_host, websockets_server_port, "/");
   if(connected) {
     Serial.println("Connected!");
     client.send("Hello Server");
   } else {
     Serial.println("Not Connected!");
   }
}

String c;

void loop() {
    if (Serial.available() > 0) { // if serial is available
      c = Serial.readStringUntil('\n'); // get the last string from the serial
      client.send(c.substring(0, c.length() - 1)); // trim the new line and send to the websocket
    }
}

how would I know websocket server address?