Asynchronously performs a TLS handshake on conn. See g_dtls_connection_handshake() for more information.
the [I/O priority][io-priority] of the request
a gio.Cancellable, or NULL
callback to call when the handshake is complete
the data to pass to the callback function
2.48
Asynchronously performs a TLS handshake on conn. See g_dtls_connection_handshake() for more information.