Hello. I am using this code to find the IP address of my arduino by connecting it to internet and then seeing the ip addresses of the devices connected. Please help me with this error on the code.
This is the code
#include <WiFi.h>
// Replace with your network credentials
const char* ssid = "My-network-name";
const char* password = "My-network-password";
// Set web server port number to 80
WiFiServer server(80);
// Variable to store the HTTP request
String header;
// Auxiliar variables to store the current output state
String output15State = "off";
String output4State = "off";
// Assign output variables to GPIO pins
const int output15 = 15;
const int output4 = 4;
// Current time
unsigned long currentTime = millis();
// Previous time
unsigned long previousTime = 0;
// Define timeout time in milliseconds (example: 2000ms = 2s)
const long timeoutTime = 2000;
// Define Authentication
const char* base64Encoding = "TWlzaE1hc2hMYWJzOm1pc2htYXNo"; // base64encoding user:pass - "dXNlcjpwYXNz", MishMashLabs:mishmash - "TWlzaE1hc2hMYWJzOm1pc2htYXNo"
// Define Static IP Settings
IPAddress local_IP(192,168,1,20);
IPAddress gateway(192,168,0,1);
IPAddress subnet(255,255,255,0);
IPAddress primaryDNS(8,8,8,8);
IPAddress secondaryDNS(8,8,4,4);
void setup() {
Serial.begin(115200);
// Initialize the output variables as outputs
pinMode(output15, OUTPUT);
pinMode(output4, OUTPUT);
// Set outputs to LOW
digitalWrite(output15, LOW);
digitalWrite(output4, LOW);
// Connect to Wi-Fi network with SSID and password
Serial.print("Connecting to ");
Serial.println(ssid);
if(!WiFi.config(local_IP, gateway, subnet, primaryDNS, secondaryDNS))
{
Serial.println("STA Failed to configure");
}
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) {
// check base64 encode for authentication
// Finding the right credentials
if (header.indexOf(base64Encoding)>=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 /15/on") >= 0) {
Serial.println("GPIO 15 on");
output15State = "on";
digitalWrite(output15, HIGH);
} else if (header.indexOf("GET /15/off") >= 0) {
Serial.println("GPIO 15 off");
output15State = "off";
digitalWrite(output15, LOW);
} else if (header.indexOf("GET /4/on") >= 0) {
Serial.println("GPIO 4 on");
output4State = "on";
digitalWrite(output4, HIGH);
} else if (header.indexOf("GET /4/off") >= 0) {
Serial.println("GPIO 4 off");
output4State = "off";
digitalWrite(output4, 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 15
client.println("<p>GPIO 15 - State " + output15State + "</p>");
// If the output15State is off, it displays the ON button
if (output15State=="off") {
client.println("<p><a href=\"/15/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/15/off\"><button class=\"button button2\">OFF</button></a></p>");
}
// Display current state, and ON/OFF buttons for GPIO 4
client.println("<p>GPIO 4 - State " + output4State + "</p>");
// If the output4State is off, it displays the ON button
if (output4State=="off") {
client.println("<p><a href=\"/4/on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/4/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{
client.println("HTTP/1.1 401 Unauthorized");
client.println("WWW-Authenticate: Basic realm=\"Secure\"");
client.println("Content-Type: text/html");
client.println();
client.println("<html>Authentication failed</html>");
}
} 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("");
}
}```
and the error message I get is this
If you have any advice on the problem, or another way of getting IP address using just Arduino(I don't have any thing besides that), please help me.