NTP ESP8266

/*
    This sketch shows how to use WiFi event handlers.

    In this example, ESP8266 works in AP mode.
    Three event handlers are demonstrated:
    - station connects to the ESP8266 AP
    - station disconnects from the ESP8266 AP
    - ESP8266 AP receives a probe request from a station

    Written by Markus Sattler, 2015-12-29.
    Updated for new event handlers by Ivan Grokhotkov, 2017-02-02.
    This example is released into public domain,
    or, at your option, CC0 licensed.
*/

#include <ESP8266WiFi.h>
#include <stdio.h>
#include <time.h>
#include <sys/time.h>
#include <PolledTimeout.h>

// Definizione del timezone e degli intervalli dell'ora legale
#define MYTZ "CET-1CEST,M3.5.0,M10.5.0/3"

// struct dove memorizzare le informazioni realtive al timedate (giorno, ora, minuti,  etc etc )
struct tm timeinfo;    // è definita in "time.h"

// timer con frequenza di 1Hz
static esp8266::polledTimeout::periodicMs showTimeNow(1000);

#ifndef APSSID
#define APSSID "xxxxxxx"
#define APPSK  "xxxxxxx"
#endif

const char* ssid     = APSSID;
const char* password = APPSK;

WiFiEventHandler connectedHandler;
WiFiEventHandler disconnectedHandler;
WiFiEventHandler gotIpEventHandler;

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  // Register event handlers.
  // Callback functions will be called as long as these handler objects exist.
  connectedHandler = WiFi.onStationModeConnected(&onConnected);
  disconnectedHandler = WiFi.onStationModeDisconnected(&onDisconnected);
  gotIpEventHandler = WiFi.onStationModeGotIP(&onStationGotIp);
}

void onStationGotIp(const WiFiEventStationModeGotIP& evt) {
  Serial.print("Station ip address: ");
  Serial.println(WiFi.localIP());
  configTime(MYTZ, "time.google.com", "time.windows.com", "pool.ntp.org");
}


void onConnected(const WiFiEventStationModeConnected& evt) {
  Serial.print("ESP connected: ");
}

void onDisconnected(const WiFiEventStationModeDisconnected& evt) {
  Serial.print("ESP disconnected: ");
}


void showTime() {
  time_t now = time(nullptr);
  timeinfo = *localtime(&now);

  char buffer [40];
  strftime (buffer,40,"%A, %D %T", &timeinfo);
  Serial.println(buffer);
}

void loop() {
  if (showTimeNow)
     showTime();
}