wpa.ino

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#ifdef __AVR__
#include <avr/power.h>
#endif

void setup() {
  Serial.begin(115200);
  Serial.println("Starting up.");
  
  attachInterrupt(digitalPinToInterrupt(D2), callback, RISING);

  //Nodemcu saves the last succesfull connection in memory
  //To delete the saved connection use
  //WiFi.disconnect();
  WiFi.begin(WiFi.SSID().c_str(),WiFi.psk().c_str()); 
  
  // Long delay required especially soon after power on.
  delay(4000);

  if (WiFi.status() != WL_CONNECTED) {
    connectWifi();  
  }
  if (WiFi.status() == WL_CONNECTED) {
    Serial.printf("Use this URL to connect: http://%s/", WiFi.localIP().toString().c_str());
  }
}

void loop() {
  // put your main code here, to run repeatedly:
}

void connectWifi() {
  Serial.println("WPS config start");
  // WPS works only in STA (Station mode)
  WiFi.mode(WIFI_STA);
  delay(1000);
  WiFi.beginWPSConfig();
  // Another long delay required.
  delay(3000);
  if (WiFi.status() == WL_CONNECTED) {
    // WPSConfig connected succesfull
    Serial.printf("WPS finished. Connected successfull to SSID '%s'", WiFi.SSID().c_str());
    Serial.println("");
    Serial.printf("Use this URL to connect: http://%s/", WiFi.localIP().toString().c_str());
  }else{
    Serial.println("WPS failed.");
  }
}


void callback(){
  connectWifi();
}