OpenSSL TLS-PSK wrapper for Python
Use ssl_psk.wrap_socket instead of 'ssl.wrap_socket' with psk paramater set to PSK key string.
wrapper = ssl_psk.wrap_socket(sock, psk='really secret secret', ciphers='PSK-AES256-CBC-SHA',
ssl_version=ssl.PROTOCOL_TLSv1,
server_side=True)
