Problem solving

Projects Programming
1 
connected but no internet im a newbie in coding please help

#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <WiFiClient.h>
#include <lwip/napt.h>
#include <DNSServer.h>

ESP8266WebServer server(80);
DNSServer dnsServer;
const char* ap_SSID = "ESP8266_Extender";
const char* ap_PASS = "12345678";

void autoConfigWiFi() {
  WiFi.begin();
  Serial.println("Attempting to connect to the last known network...");
  unsigned long startTime = millis();
  while (WiFi.status() != WL_CONNECTED && millis() - startTime < 30000) {
    delay(500);
    Serial.print(".");
  }
  
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\nReconnected to known Wi-Fi!");
    Serial.print("IP Address: ");
    Serial.println(WiFi.localIP());
  } else {
    Serial.println("\nNo known networks available. Staying in AP mode.");
  }
}

bool checkInternet() {
  WiFiClient client;
  return client.connect("8.8.8.8", 53);
}

void setup() {
  Serial.begin(115200);
  delay(10);

  WiFi.mode(WIFI_AP_STA);
  WiFi.softAP(ap_SSID, ap_PASS);
  delay(1000);
  dnsServer.start(53, "*", WiFi.softAPIP());
  autoConfigWiFi();

  Serial.print("AP Started. Connect to: ");
  Serial.println(ap_SSID);
  Serial.print("AP IP Address: ");
  Serial.println(WiFi.softAPIP());

  if (WiFi.status() == WL_CONNECTED) {
    WiFi.setAutoReconnect(true);
    WiFi.persistent(true);
    ip_napt_enable(WiFi.localIP(), 1);
    Serial.println("NAT Enabled.");
  }
  
  server.on("/", handleRoot);
  server.on("/connect", HTTP_POST, handleConnect);
  server.begin();
  Serial.println("Web Server started.");
}

void handleRoot() {
  String html = "<html><head><title>ESP8266 Wi-Fi Repeater</title></head><body>";
  html += "<h2>Available Networks</h2>";
  int numNetworks = WiFi.scanNetworks();

  if (numNetworks == 0) {
    html += "<p>No networks found.</p>";
  } else {
    html += "<form action='/connect' method='POST'>";
    for (int i = 0; i < numNetworks; i++) {
      html += "<input type='radio' name='ssid' value='" + WiFi.SSID(i) + "'>" + WiFi.SSID(i) + "<br>";
    }
    html += "<br>Password: <input type='password' name='password'><br>";
    html += "<input type='submit' value='Connect'>";
    html += "</form>";
  }
  html += "</body></html>";
  server.send(200, "text/html", html);
}

void handleConnect() {
  String ssid = server.arg("ssid");
  String password = server.arg("password");

  if (ssid.length() == 0) {
    server.send(400, "text/html", "<h2>Error! Empty SSID.</h2>");
    return;
  }
  
  Serial.println("Switching to STA mode...");
  WiFi.disconnect();
  WiFi.begin(ssid.c_str(), password.length() ? password.c_str() : NULL);

  unsigned long startTime = millis();
  while (WiFi.status() != WL_CONNECTED && millis() - startTime < 30000) {
    delay(500);
    Serial.print(".");
  }
  
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\nConnected to Wi-Fi!");
    Serial.print("IP Address: ");
    Serial.println(WiFi.localIP());
    Serial.print("Gateway: ");
    Serial.println(WiFi.gatewayIP());
    Serial.print("Subnet: ");
    Serial.println(WiFi.subnetMask());
    Serial.print("DNS: ");
    Serial.println(WiFi.dnsIP());
    
    WiFi.setAutoReconnect(true);
    WiFi.persistent(true);
    ip_napt_enable(WiFi.localIP(), 1);
    Serial.println("NAT Enabled for internet sharing.");
    
    if (checkInternet()) {
      Serial.println("Internet access confirmed.");
      server.send(200, "text/html", "<h2>Connected successfully!</h2><p>IP Address: " + WiFi.localIP().toString() + "</p>");
    } else {
      Serial.println("No internet access.");
      server.send(400, "text/html", "<h2>Connected, but no internet access.</h2>");
    }
  } else {
    Serial.println("\nFailed to connect.");
    server.send(400, "text/html", "<h2>Failed to connect. Please try again.</h2>");
  }
}

void loop() {
  server.handleClient();
  dnsServer.processNextRequest();
}
2

What’s the question ?

3

It’s connected to your WLAN, not directly exposed to the internet as a web server. You can only access it from a browser on any computer in the same LAN unless you poke a hole in your network to make the ESP reachable from the Internet.

1 Like
4

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