anchor.diff:      {ok, State :: term()} |
       {reply, websocket_req:frame(), State :: term()} |
       {close, Reply :: binary(), State :: term()}.
  +websocket_info(register, _ConnState, _State) ->
  +    ?error("INFO ~p", [register]),
  +    try
  +        true = register(?MODULE, self()),
  +        {ok, _State}
  +    catch
  +        E:R ->
  +            ?error_stacktrace("Unable to register ~p:~p", [E, R]),
  +            {close, <<"closed">>, _State}
  +    end;
  +
   websocket_info(_Msg, _ConnState, _State) ->
       ?error("INFO ~p", [_Msg]),
       {ok, _State}.
  
positive.code:     CertFile = oz_plugin:get_cert_path(),
      Options = [{keyfile, KeyFile}, {certfile, CertFile}, {cacertfile, CACertFile}],
  
      websocket_client:start_link(Address, ?MODULE, [], Options).
  
  %%--------------------------------------------------------------------
  %% @doc
  
negative.code:     {ok, State :: term()} | {ok, State :: term(), Keepalive :: integer()}.
  init([], _ConnState) ->
      ?error("INIT ~p", [_ConnState]),
      {ok, #{}}.
  
  %%--------------------------------------------------------------------
  