how to close a TCP TLS socket

[accacca]

I want to implement an FTPS server For testing it I use filezilla.
The FTP version of the server works now I was adding TLS handshaking.
When I open a session, the client asks me for the list of files in the root folder butwhen data socket but when closing data socket I get this error message

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Risposta:	226 Closing data connection - Transfer complete
Errore:	Errore GnuTLS -110 in gnutls_record_recv: The TLS connection was non-properly terminated.
Stato:	Il server non ha correttamente chiuso la connessione TLS (The server did not properly close the TLS connection)

I was initially closing the socket only with

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esp_tls_server_session_delete

Then I added this call to send the close message

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mbedtls_ssl_close_notify

So it works but is this the correct solution ? should I explicitly call the function that sends the close_notify message ?