anchor.diff:      tls_connection_sup;
   connection_sup(dtls_connection) ->
       dtls_connection_sup.
  +
  +binary_filename(FileName) ->
  +    Enc = file:native_name_encoding(),
  +    unicode:characters_to_binary(FileName, unicode, Enc).
  
positive.code:     undefined;
  validate_option(srp_identity, {Username, Password})
    when is_list(Username), is_list(Password), Username =/= "", length(Username) =< 255 ->
      {list_to_binary(Username), list_to_binary(Password)};
  
  validate_option(ciphers, Value)  when is_list(Value) ->
      Version = tls_record:highest_protocol_version([]),
  
negative.code: validate_option(certfile, Value) when is_binary(Value) ->
      Value;
  validate_option(certfile, Value) when is_list(Value) ->
      binary_filename(Value);
  
  validate_option(key, undefined) ->
      undefined;
  