Deprecate realtime_box_best_effort.h properly

include/realtime_tools/realtime_box_best_effort.h

@@ -0,0 +1,30 @@
+// Copyright 2024 ros2_control Development Team
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef REALTIME_TOOLS__REALTIME_BOX_BEST_EFFORT_H_
+#define REALTIME_TOOLS__REALTIME_BOX_BEST_EFFORT_H_
+
+#include "realtime_tools/realtime_box.h"
+
+// Deprecation notice
+#ifdef _WIN32
+#pragma message( \
+  "This header include is deprecated. Please update your code to use 'realtime_box.h' header.")  //NOLINT
+#else
+#warning \
+  "This header include is deprecated. Please update your code to use 'realtime_box.h' header." //NOLINT
+#endif
+
+
+#endif  // REALTIME_TOOLS__REALTIME_BOX_BEST_EFFORT_H_