shutdown abstract method
void shutdown(Shutdown the socket in the direction. Calling shutdown will never throw an exception and calling it several times is supported. Calling shutdown with either SocketDirection.BOTH or SocketDirection.RECEIVE can result in a RawSocketEvent.READ_CLOSED event.
Source
void shutdown(SocketDirection direction);
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https://api.dartlang.org/stable/1.24.3/dart-io/RawSocket/shutdown.html