Fix restart logic and add watchdog

src/gmhc_sup.erl

@@ -15,10 +15,11 @@ start_link() ->
     supervisor:start_link({local, ?MODULE}, ?MODULE, []).
 
 init([]) ->
-    ChildSpecs = [ worker(gmhc_server)
+    ChildSpecs = [ worker(gmhc_watchdog)
+                 , worker(gmhc_server)
                  , worker(gmhc_handler)
                  , supervisor(gmhc_connectors_sup) ],
-    SupFlags = #{ strategy      => one_for_one
+    SupFlags = #{ strategy      => rest_for_one
                 , intensity     => 1
                 , period        => 5
                 , auto_shutdown => never },