#include <Arduino.h>

#define TIME_TO_SLEEP_uS 5 * 1000000

RTC_DATA_ATTR int bootCount = 0;

void print_wakeup_by()
{
    esp_sleep_wakeup_cause_t wakeup_reason;

    wakeup_reason = esp_sleep_get_wakeup_cause();

    switch (wakeup_reason)
    {
    case ESP_SLEEP_WAKEUP_EXT0:
        Serial.println("Wakeup caused by external signal using RTC_IO");
        break;
    case ESP_SLEEP_WAKEUP_EXT1:
        Serial.println("Wakeup caused by external signal using RTC_CNTL");
        break;
    case ESP_SLEEP_WAKEUP_TIMER:
        Serial.println("Wakeup caused by timer");
        break;
    case ESP_SLEEP_WAKEUP_TOUCHPAD:
        Serial.println("Wakeup caused by touchpad");
        break;
    case ESP_SLEEP_WAKEUP_ULP:
        Serial.println("Wakeup caused by ULP program");
        break;
    default:
        Serial.printf("Wakeup was not caused by deep sleep: %d\n", wakeup_reason);
        break;
    }
}

void setup()
{
    Serial.begin(9600);
    delay(1000);
    ++bootCount;
    Serial.println("Boot number: " + String(bootCount));
    print_wakeup_by();

    esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP_uS); 
    Serial.println("Setup ESP32 to sleep for every " + String(TIME_TO_SLEEP_uS / 1000000) +
                   " Seconds");
    Serial.println("Going to sleep now");
    delay(1000);
    Serial.flush();
    esp_deep_sleep_start();
    Serial.println("This will never be printed");
}

void loop()
{
    // This is not going to be called
}