Check NonBlocking I/O functionality

[mortensen]

" Because the SSLSocket class is based on a blocking I/O model, the Java Development Kit (JDK) includes a nonblocking SSLEngine class to enable implementations to choose their own I/O methods."

https://docs.oracle.com/en/java/javase/11/security/java-secure-socket-extension-jsse-reference-guide.html#GUID-0EF5DA4E-856C-4AD2-A9FD-0837C5881DDA