DTLSSocketWrapper is equivalent of TLSSocketWrapper but uses datagram mode
and timers for handling Mbed TLS timeouts.
Non-blocking connections were not working earlier, now fixed for both
secure socket modes.
Transport is a member of TLSSocket which is derived from TLSSocketWrapper.
Make sure that TLSSocketWrapper::close() is called before the transport is
destroyed.
Provide TLSSocket implementation. This implementation allows TLSSocket
to wrap around any existing socket. Currently only TLS supported. DTLS
not yet implemented.
Design document also provided with the implementation.
Documentation submitted to Mbed OS handbook.
Seppo Takalo