anchor.diff:  %%% # connection_down/2
   %%% ---------------------------------------------------------------------------
   
  -%% Peer process has transitioned out of the open state.
  +%% Watchdog has transitioned out of state OKAY.
   
   connection_down(Pid, #state{peerT = PeerT,
                               connT = ConnT}
  
positive.code: 
  %% Watchdog is sending notification of a state transition. Note that
  %% the connection_up/down messages are pre-date this message and are
  %% still used. A 'watchdog' message will follow these and communicate
  %% the same state as was set in handling connection_up/down.
  transition({watchdog, Pid, {TPid, From, To}}, #state{service_name = SvcName,
                                                       peerT = PeerT}) ->
  
negative.code: closed(_, _, _) ->
      ok.
  
  %% The watchdog has never reached OKAY ...
  peer_down(#peer{conn = B}, _)
    when is_boolean(B) ->
      ok;
  