Looks for the next valid integer in the incoming serial stream. parseInt() inherits from the Stream utility class.
Initial characters that are not digits or a minus sign, are skipped;
Parsing stops when no characters have been read for a configurable time-out value, or a non-digit is read;
If no valid digits were read when the time-out (see Serial.setTimeout()) occurs, 0 is returned;
Arduino Mega only:
- skipChar: used to skip the indicated char in the search. Used for example to skip thousands divider.