/*
https://garretlab.web.fc2.com/arduino/lab/ntp/
https://www.ei.tohoku.ac.jp/xkozima/lab/espTutorial0wifi.html
*/

#include <WiFi.h>
 
const char *ssid = "your-ssid";
const char *password = "your-password";
 IPAddress ip;
 
void setup() {
/* wifi --dhcp client --connect */
  Serial.begin(115200);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) {
    delay(500); Serial.print(".");
  }
  Serial.println();
//  Serial.println("IP address:");
//  Serial.println(WiFi.localIP());
  
/*
ntpサーバのIPアドレス,FQDNを記述 複数台記述可能
 "192.168.xx.xx", "ntp.aaa.com", ...
*/
  configTime(9 * 3600L, 0, "192.168.xx.xx"); 
}
 
void loop() {
  struct tm timeInfo;
  char s[32];
 
  getLocalTime(&timeInfo);
  sprintf(s, " %04d/%02d/%02d %02d:%02d:%02d",
          timeInfo.tm_year + 1900, timeInfo.tm_mon + 1, timeInfo.tm_mday,
          timeInfo.tm_hour, timeInfo.tm_min, timeInfo.tm_sec);
/* 現在の時刻をシリアルモニタに表示 */
   Serial.println(s);

  delay(1000);
}