Wifi Example

wifi.h

const char* ssid     = "yourssid";
const char* password = "yourpassword";
const char* deviceName = "ghsw8181";

wifi.ino

#include <ESP8266WebServer.h>
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include "wifi.h"

ESP8266WebServer server(80);

void setup() {
  connectToWifi();

  server.on("/", [](){
    server.send(200, "text/plain", "ok");
  });

  server.begin();
}

void connectToWifi() {
  WiFi.hostname(deviceName);
  WiFi.mode(WIFI_STA); // Client only
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }

  if (!MDNS.begin(deviceName)) {
    Serial.println("mDNS responder setup failed");
  }
}

void loop() {
  if (WiFi.status() != WL_CONNECTED) {
    connectToWifi();
  }
  server.handleClient();
}