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SerialPortStream is an independent implementation of System.IO.Ports.SerialPort and SerialStream for better reliability and maintainability.
The SerialPortStream is a ground up implementation of a Stream that buffers data to and from a serial port. It uses low level Win32API for managing events and asynchronous I/O, using a programming model as in the MSDN PipeServer example.
Microsoft already provides a reasonable implementation for accessing the serial port. Unfortunately, documentation is sparse. When one tries to find information about how to program the serial port one comes across instead many blogs and forums describing the issues that they've observed.
Through the implementation of SerialPortStream, I've used ILSpy to reverse engineer how the Microsoft implementation works, discovering many other subtle, but noteworthy implementation issues.