Login to captive portal https://iqfareez.com/blog/hacking-wifi-captive-portal-1

captive_portal_login.ino

#include <WiFi.h>
#include <Wire.h>
#include <HTTPClient.h>

#define AP_SSID "IIUM-Student"
#define AP_PASSWORD "" // leaves empty if open wifi

const String username = "1111111";
const String password = "blahblah";

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  // Connecting to the WIFI AP
  WiFi.begin(AP_SSID, AP_PASSWORD);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Connecting to WiFi..");
  }

  Serial.println("Connected to the WiFi network");

  // Login to Captive Portal
  HTTPClient login;
  login.begin("http://captiveportalmahallahgombak.iium.edu.my/cgi-bin/login");
  String body = "user=" + String(username) + "&password=" + String(password) + "&cmd=authenticate&Login=Log%2BIn";
  int res = login.POST(body);

  Serial.println(res);

  if (res == 200) {
    Serial.println("Authentication IIUM successful");
  }

  login.end();
}

void loop() {
  // put your main code here, to run repeatedly:
  HTTPClient http;
  http.begin("https://iqfareez.com/api/hello");
  int res = http.GET();

  Serial.println(res); // status code
  Serial.println(http.getString()); // API response

  delay(2000);
}

@iqfareez Thank you for giving me sources and information.

Hi, can I have your email? I'd like to discuss via email if allowed.