Connect to a website and shine an LED using ESP32

esp32wifi.ino

// wifi library
#include <WiFi.h>

// WiFi network name and password:
const char * networkName = "YOUR_WIFI_HERE";
const char * networkPswd = "PASSWORD_HERE";

// The domain to request from:
const char * hostDomain = "chrisg.org";
const int hostPort = 80;

// whichever pin your LED is attached
const int LED_PIN = 5;

void setup()
{
  // set the baud rate:
  Serial.begin(115200);

  // set the LED pin to output
  pinMode(LED_PIN, OUTPUT);

  // Function for the wifi, see below 
  connectToWiFi(networkName, networkPswd);

}

// do this forever
void loop()
{

    // LED on
    digitalWrite(LED_PIN, HIGH); 
  
    // get the web page
    requestURL(hostDomain, hostPort);
  
    // LED off
    digitalWrite(LED_PIN, LOW); 
  
    // wait a second
    delay(1000);
}

// function to connect
void connectToWiFi(const char * ssid, const char * pwd)
{
  // init the LED state
  int ledState = 0;
  
  // connecting message
  Serial.println("Connecting to your network: " + String(ssid));

  // start the wifi
  WiFi.begin(ssid, pwd);

  // loop while not connected
  while (WiFi.status() != WL_CONNECTED) 
  {
    // Blink LED
    digitalWrite(LED_PIN, ledState);
    
    // switch state between on and off
    ledState = (ledState + 1) % 2; 
    
    // wait half a second
    delay(500);
    
    // dots
    Serial.print(".");
  }

  // blank line
  Serial.println();
  
  // yay!
  Serial.println("WiFi connected!");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
}

// grab the html
void requestURL(const char * host, uint8_t port)
{
  // status 
  Serial.println("Connecting to domain: " + String(host));

  // Use WiFiClient to get TCP connection
  WiFiClient client;
  if (!client.connect(host, port))
  {
    Serial.println("connection failed");
    return;
  }
  
  // connected!
  Serial.println("Connected!");

  // send the HTTP GET request 
  client.print((String)"GET / HTTP/1.1\r\n" +
               "Host: " + String(host) + "\r\n" +
               "Connection: close\r\n\r\n");
  
  // timeout
  unsigned long timeout = millis();
  while (client.available() == 0) 
  {
    if (millis() - timeout > 5000) 
    {
      Serial.println(">>> Client Timeout !");
      client.stop();
      return;
    }
  }

  // Read + print to serial monitor
  while (client.available()) 
  {
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }

  // all done
  Serial.println();
  Serial.println("closing connection");
  client.stop();
}