WiFiServer server(80);
// Variable to store the HTTP request
String header;
// Auxiliar variables to store the current output state
String output26State = "off";
String output27State = "off";
// Assign output variables to GPIO pins
const int output26 = 26;
const int output27 = 27;
// Current time
unsigned long currentTime = millis();
// Previous time
unsigned long previousTime = 0;
// Define timeout time in milliseconds (example: 2000ms = 2s)
const long timeoutTime = 2000;
/*
For DDNS Providers where you get a token:
Use this: EasyDDNS.client("domain", "token");
For DDNS Providers where you get username and password: ( Leave the password field empty "" if not required )
Use this: EasyDDNS.client("domain", "username", "password");
*/
EasyDDNS.client("myhostname.zapto.org", "myname", "mypw");
EasyDDNS.update(1000);
// Get Notified when your IP changes
EasyDDNS.onUpdate([&](const char oldIP, const char newIP){
Serial.print("EasyDDNS - IP Change Detected: ");
Serial.println(newIP);
});
}
void loop() {
// Check for new public IP every 10 seconds
WiFiClient client = server.available();
uint8_t data[12];
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();
// turns the GPIOs on and off
if (header.indexOf("GET /26/on") >= 0) {
Serial.println("GPIO 26 on");
output26State = "on";
digitalWrite(output26, HIGH);
} else if (header.indexOf("GET /26/off") >= 0) {
Serial.println("GPIO 26 off");
output26State = "off";
digitalWrite(output26, LOW);
} else if (header.indexOf("GET /27/on") >= 0) {
Serial.println("GPIO 27 on");
output27State = "on";
digitalWrite(output27, HIGH);
} else if (header.indexOf("GET /27/off") >= 0) {
Serial.println("GPIO 27 off");
output27State = "off";
digitalWrite(output27, LOW);
}
// Display the HTML web page
client.println("<!DOCTYPE html><html>");
client.println("<head><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>ESP32 Web Server</h1>");
// Display current state, and ON/OFF buttons for GPIO 26
client.println("<p>GPIO 26 - State " + output26State + "</p>");
// If the output26State is off, it displays the ON button
if (output26State=="off") {
client.println("<p><a href=\"/26/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/26/off\"><button class=\"button button2\">OFF</button></a></p>");
}
// Display current state, and ON/OFF buttons for GPIO 27
client.println("<p>GPIO 27 - State " + output27State + "</p>");
// If the output27State is off, it displays the ON button
if (output27State=="off") {
client.println("<p><a href=\"/27/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/27/off\"><button class=\"button button2\">OFF</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("");
I combined the example from EasyDDNS and https://randomnerdtutorials.com/esp32-web-server-arduino-ide/.
The web page can access from local IP but cannot be accessed from DDNS hostname.
Here is my code:
include "WiFi.h"
include "HTTPClient.h"
include
const char ssid = "ssid"; const char password = "pw";
WiFiServer server(80); // Variable to store the HTTP request String header;
// Auxiliar variables to store the current output state String output26State = "off"; String output27State = "off";
// Assign output variables to GPIO pins const int output26 = 26; const int output27 = 27;
// Current time unsigned long currentTime = millis(); // Previous time unsigned long previousTime = 0; // Define timeout time in milliseconds (example: 2000ms = 2s) const long timeoutTime = 2000;
void setup() { Serial.begin(115200); IPAddress ip(192,168,1,20); IPAddress gateway(192,168,1,1); IPAddress subnet(255,255,255,0); IPAddress primaryDNS(8, 8, 8, 8); WiFi.config(ip, gateway, subnet,primaryDNS); WiFi.mode(WIFI_STA); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(WiFi.localIP()); // Print the IP address server.begin();
/* List of supported DDNS providers:
"afraid.org" */ EasyDDNS.service("noip");
/* For DDNS Providers where you get a token: Use this: EasyDDNS.client("domain", "token");
For DDNS Providers where you get username and password: ( Leave the password field empty "" if not required ) Use this: EasyDDNS.client("domain", "username", "password"); */
EasyDDNS.client("myhostname.zapto.org", "myname", "mypw"); EasyDDNS.update(1000); // Get Notified when your IP changes EasyDDNS.onUpdate([&](const char oldIP, const char newIP){ Serial.print("EasyDDNS - IP Change Detected: "); Serial.println(newIP); }); }
void loop() { // Check for new public IP every 10 seconds WiFiClient client = server.available(); uint8_t data[12];
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();
} EasyDDNS.update(10000); }