nodemcu esp8266 on off timer switch script

nodemcu_esp8266_on_off_timer_switch.ino

#define RTCMEMORYSTART 65
#define MAXHOUR 11 // number of hours to deep sleep for

extern "C" {
#include "user_interface.h"
}

typedef struct {
  int count;
} rtcStore;

rtcStore rtcMem;


const long onInterval = 2*60*1000;
const long offInterval = 60*60;
unsigned long cm = 0;
void setup() {
  // put your setup code here, to run once:
  cm = millis();

  Serial.begin(115200);
  Serial.setTimeout(2000);
  while(!Serial) { }
  delay(1000);

  Serial.println("");

  Serial.print("Waking up...");
  Serial.println(millis()-cm);

  Serial.print("Reading ");
  readFromRTCMemory();
  Serial.print("Writing ");
  writeToRTCMemory();
  Serial.print("Current Count ");
  Serial.println(rtcMem.count);

  if (rtcMem.count == 0) {
    pinMode(D4,OUTPUT);
    Serial.println("Start!");
    delay(100);
    Serial.println(millis()-cm);
    digitalWrite(D4, LOW);
    delay(onInterval);
    Serial.println(millis()-cm);
  } 
  delay(100);
  Serial.println("Sleep!");
  ESP.deepSleep(offInterval*1000000UL, WAKE_RF_DEFAULT);

}

void readFromRTCMemory() {
  system_rtc_mem_read(RTCMEMORYSTART, &rtcMem, sizeof(rtcMem));

  if (rtcMem.count < 0){
    rtcMem.count = 0;
    system_rtc_mem_write(RTCMEMORYSTART, &rtcMem, 4);

    pinMode(D4,OUTPUT);
    Serial.println("Start!");
    delay(100);

    digitalWrite(D4, LOW);
    delay(onInterval);
  }

  Serial.print("read count = ");
  Serial.println(rtcMem.count);
  yield();
}

void writeToRTCMemory() {
  if (rtcMem.count <= MAXHOUR) {
    rtcMem.count++;
  } else {
    rtcMem.count = 0;
  }

  system_rtc_mem_write(RTCMEMORYSTART, &rtcMem, 4);

  Serial.print("write count = ");
  Serial.println(rtcMem.count);
  yield();
}


void loop() {

}