wolfSSL remains agnostic to network socket behavior be it blocking or non-blocking. The non-blocking flag was meant for the default EmbedRecvFrom() callback for use with UDP to assist the timing of the handshake.
1. Deprecate wolfSSL_set_using_nonblock() and wolfSSL_get_using_nonblock() for use with TLS sockets. They become don't-cares when used with TLS sessions.
2. Added functions wolfSSL_dtls_set_using_nonblock() and wolfSSL_dtls_get_using_nonblock().
3. Removed a test case from EmbedReceive() that only applied to UDP.
4. Removed the checks for non-blocking sockets from EmbedReceive().
5. Socket timeouts only apply to DTLS sessions.
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