WiFi-Server - Wokwi ESP32, STM32, Arduino Simulator

/*
  ESP32 WiFi Access Point (Server)
  This sketch creates a WiFi network (Access Point) and starts a server.
  It waits for a client to connect and then listens for messages from it.
  When a message is received, it prints it to the Serial Monitor and
  sends a confirmation message back to the client.
*/

#include <WiFi.h>

// --- WiFi Network Settings ---
// Set the name (SSID) and password for the WiFi network you want to create.
const char* ssid = "ESP32-AP";
const char* password = "password123";

// --- Server Settings ---
// The server will listen on port 80, the standard port for HTTP.
WiFiServer server(80);

void setup() {
  // Start the Serial Monitor at a baud rate of 115200.
  Serial.begin(115200);
  Serial.println("\nConfiguring Access Point...");

  // Start the WiFi Access Point.
  // The 'true' parameter makes the network visible.
  WiFi.softAP(ssid, password);

  // Get the IP address of the Access Point.
  // In Wokwi, this will always be 192.168.4.1.
  IPAddress myIP = WiFi.softAPIP();
  Serial.print("AP IP address: ");
  Serial.println(myIP);

  // Start the server.
  server.begin();
  Serial.println("Server started. Waiting for clients...");
}

void loop() {
  // Check if a client has connected to the server.
  WiFiClient client = server.available();
  
  // If no client is connected, the 'client' object will be false.
  if (!client) {
    return; // Exit the loop and check again.
  }

  // A client has connected!
  Serial.println("New client connected!");

  // Wait until the client sends some data.
  while (!client.available()) {
    delay(1);
  }

  // Read the first line of the request from the client.
  String request = client.readStringUntil('\r');
  Serial.print("Received from client: ");
  Serial.println(request);

  // Send a response back to the client.
  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println(""); // Important: empty line signifies end of headers
  client.println("<!DOCTYPE HTML>");
  client.println("<html>");
  client.println("<head><title>ESP32 Server</title></head>");
  client.println("<body><h1>Hello from the ESP32 Server!</h1></body>");
  client.println("</html>");
  
  // Flush the client buffer and wait a moment.
  client.flush();
  delay(5);

  Serial.println("Response sent to client.");
  Serial.println("Client disconnected.");
  Serial.println("------------------------");
}