anchor.diff:  with TLS support.
   
   |===
  -| <<nng_tls_config_auth_alloc#,nng_tls_config_alloc(3)>>|allocate TLS configuration
  -| <<nng_tls_config_auth_mode#,nng_tls_config_auth_mode(3)>>|set authentication mode
  -| <<nng_tls_config_ca_chain#,nng_tls_config_ca_chain(3)>>|set certificate authority chain
  -| <<nng_tls_config_ca_file#,nng_tls_config_ca_file(3)>>|load certificate authority from file
  -| <<nng_tls_config_cert_key_file#,nng_tls_config_cert_key_file_cert(3)>>|load own certificate and key from file
  -| <<nng_tls_config_own_cert#,nng_tls_config_own_cert(3)>>|set own certificate and key
  -| <<nng_tls_config_free#,nng_tls_config_free(3)>>|free TLS configuration
  -| <<nng_tls_config_server_name#,nng_tls_config_server_name(3)>>|set remote server name
  +|<<nng_tls_config_auth_alloc#,nng_tls_config_alloc(3)>>|allocate TLS configuration
  +|<<nng_tls_config_auth_mode#,nng_tls_config_auth_mode(3)>>|set authentication mode
  +|<<nng_tls_config_ca_chain#,nng_tls_config_ca_chain(3)>>|set certificate authority chain
  +|<<nng_tls_config_ca_file#,nng_tls_config_ca_file(3)>>|load certificate authority from file
  +|<<nng_tls_config_cert_key_file#,nng_tls_config_cert_key_file_cert(3)>>|load own certificate and key from file
  +|<<nng_tls_config_own_cert#,nng_tls_config_own_cert(3)>>|set own certificate and key
  +|<<nng_tls_config_free#,nng_tls_config_free(3)>>|free TLS configuration
  +|<<nng_tls_config_server_name#,nng_tls_config_server_name(3)>>|set remote server name
   |===
   
   
  
positive.code: protocol:
  
  |===
  | <<nng_bus#,nng_bus_open(3)>>|open a bus socket
  | <<nng_pair#,nng_pair_open(3)>>|open a pair socket
  | <<nng_pub#,nng_pub_open(3)>>|open a pub socket
  | <<nng_rep#,nng_rep_open(3)>>|open a rep socket
  | <<nng_req#,nng_req_open(3)>>|open a req socket
  | <<nng_respondent#,nng_respondent_open(3)>>|open a respondent socket
  | <<nng_sub#,nng_sub_open(3)>>|open a sub socket
  | <<nng_surveyor#,nng_surveyor_open(3)>>|open a surveyor socket
  |===
  
  === Transports
  
negative.code: 
  |===
  |<<nng_alloc#,nng_alloc(3)>>|allocate memory
  |<<nng_free#,nng_free(3)>>|free memory
  |<<nng_strerror#,nng_strerror(3)>>|return an error description
  |===
  