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esp32 deep sleep

  esp_sleep_enable_timer_wakeup(5 * 1000000 );  //5 seconds
  Serial.println("Setup ESP32 to sleep for every " + String(5) +  " Seconds");
  Serial.println("Going to sleep now");
  Serial.flush(); 
  esp_deep_sleep_start();

esp32 light sleep

  esp_sleep_enable_timer_wakeup(5 * 1000000 );  //5 seconds
  esp_deep_sleep_start();