/// <summary>
/// Gets an observable sequence of all the characters received by a serial port.
/// </summary>
/// <param name="port">The port that is to be the data source.</param>
/// <returns><see cref="IObservable{char}" /> - an observable sequence of characters.</returns>
public static IObservable <char> ReceivedCharacters(this ISerialPort port)
{
var observableEvents = port.ObservableDataReceivedEvents();
var observableCharacterSequence = from args in observableEvents
where args.EventArgs.EventType == SerialData.Chars
from character in port.ReadExisting()
select character;
return(observableCharacterSequence);
}