SO_RCVTIME0 works only with operating system level sockets. A SSLSocket is not an OS level. It's a high level abstraction layer that wraps either a file descriptor or a memory BIO. A read operation on a SSLSocket can perform write, a write operation can perform read. For the initial handshake, it will do both.

This means that SO_RCVTIME0 is not supported. Either you have to use the SSLSocket's timeout feature or do your own socket io and use a memory BIO. The internal timeout feature is build around select()/poll() syscall and low level OpenSSL calls.