   }
 }
 
+// Flash onboard LED.
 void flashLED() {
   int ledState = digitalRead(onBoardLEDPin);
   if (ledState == HIGH) {

  return formateClockTime(daysLeft, h, m, s);
}

// format time in DD:HH:MM:SS
String formateClockTime(int days, int hours, int minutes, int seconds) {
  return printDigits(days, true) + printDigits(hours, true) + printDigits(minutes, true) + printDigits(seconds, false);
}

/*
 * Print out digits appending necessary leading zero's and colons.
 *
 * @param digits - integer digits to print
 * @param bColon - true to include a trailing colon, false to not
 * @return String representation of digits
 */
String printDigits(int digits, boolean bColon) {
  String s;
