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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.
The wolfSSL manual is available at: http://www.wolfssl.com/documentation/wolfSSL-Manual.pdf