code: def new_client_stream(self, sock):
          
  
          assert sock
          newsocket, fromaddr = sock.accept()
          logger.debug("New connection from"
                       " %s:%s", fromaddr[0], fromaddr[1])
          # NB: Despite the name, ssl.PROTOCOL_SSLv23 selects the highest
          # protocol version that both the client and server support. In modern
          # Python versions (>= 3.4) it supports TLS >= 1.0 with SSLv2 and SSLv3
          # being disabled. For Python >=3.5, PROTOCOL_SSLv23 is an alias for
          # PROTOCOL_TLS which should be used once compatibility with Python 3.4
          # is no longer desired.
          try:
              ssl_socket = ssl.wrap_socket(newsocket, cert_reqs=ssl.CERT_REQUIRED,
                                           server_side=True,
                                           certfile=self.certs['cert_file'],
                                           keyfile=self.certs['key_file'],
                                           ca_certs=self.certs['ca_file'],
                                           ssl_version=ssl.PROTOCOL_SSLv23)
          except (ssl.SSLError, socket.error) as message:
              logger.error(message)
              return None
          return ssl_socket
docs: Returns a new ssl client stream from bind_socket.