typedef struct nng_tls_config nng_tls_config;
nng_tls_config represents a single TLS configuration object, which
can be used to configure TLS servers and clients.
Configuration data includes details such as certificate chains used for validation of remote peers, local key and certificate material, server names, and so forth. Additionally, a configuration can be used either in client mode, or in server mode.
Configuration objects may be shared, and are reference counted. However once a configuration is used, it enters a read-only state that precludes further modifications to the configuration.