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esp_server.ino
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/*********
Base code for the server was taken from
https://randomnerdtutorials.com/esp32-web-server-arduino-ide/
*********/
// Load Wi-Fi library
#include <WiFi.h>
//for WakeOnLan
#include <WiFiUdp.h>
#include <WakeOnLan.h>
// Replace with your credentials
const char* ssid = "WiFi name";
const char* password = "WiFi password";
const char* MACAddress = "MAC address of the device to be woken up";
// Set web server port number to 80
WiFiServer server(80);
//set up WiFiUDP to send WOL messages
WiFiUDP UDP;
WakeOnLan WOL(UDP);
// Variable to store the HTTP request
String header;
// Timing for handling HTTP
unsigned long currentTime = millis();
unsigned long previousTime = 0;
const long timeoutTime = 2000;
void wakeMyPC() {
WOL.setRepeat(3, 100);
WOL.calculateBroadcastAddress(WiFi.localIP(), WiFi.subnetMask());
WOL.sendMagicPacket(MACAddress); // Send Wake On Lan packet with the above MAC address. Default to port 9.
// WOL.sendMagicPacket(MACAddress, 7); // Change the port number
}
void setup() {
Serial.begin(115200);
Serial.print("MAC address of ESP32: ");
Serial.println(WiFi.macAddress());
// Connect to Wi-Fi network with SSID and password
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
// Print local IP address and start web server
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
server.begin();
}
void loop(){
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
currentTime = millis();
previousTime = currentTime;
Serial.println("New Client."); // print a message out in the serial port
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected() && currentTime - previousTime <= timeoutTime) { // loop while the client's connected
currentTime = millis();
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
header += c;
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
// Theck if the client asked to turn on PC
if (header.indexOf("GET /on") >= 0) {
Serial.println("Client requested to turn on the copmuter");
wakeMyPC();
}
// Display the HTML web page
client.println("<!DOCTYPE html><html>");
client.println("<head><title>WakeOnLan</title><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
client.println("<link rel=\"icon\" href=\"data:,\">");
// CSS to style the on/off buttons
// Feel free to change the background-color and font-size attributes to fit your preferences
client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #555555;}</style></head>");
// Web Page Heading
client.println("<body><h1>WakeOnLan</h1>");
client.println("<p><a href=\"/on\"><button class=\"button\">Turn On Computer</button></a></p>");
client.println("</body></html>");
// The HTTP response ends with another blank line
client.println();
// Break out of the while loop
break;
} else { // if you got a newline, then clear currentLine
currentLine = "";
}
} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
}
}
// Clear the header variable
header = "";
// Close the connection
client.stop();
Serial.println("Client disconnected.");
Serial.println("");
}
}