get_tls_protocol_version
Description:
Gets the TLS protocol version negotiated for this's connection.
If the message connection is not SSL, g_tls_protocol_version_unknown is returned.
Parameters:
| this | a Message | 
Gets the TLS protocol version negotiated for this's connection.
If the message connection is not SSL, g_tls_protocol_version_unknown is returned.
| this | a Message |