Add ability to configure maximum packet size for sync data

Change-Id: Iab7913d094a1b5d64ef5cc8e00b2624993b59ab5
Refs: #4140
diff --git a/src/logic.hpp b/src/logic.hpp
index f1f6a0e..d33ed39 100644
--- a/src/logic.hpp
+++ b/src/logic.hpp
@@ -525,6 +525,10 @@
   static int s_instanceCounter;
 };
 
+#ifdef CHRONOSYNC_HAVE_TESTS
+size_t
+getMaxPacketLimit();
+#endif // CHRONOSYNC_HAVE_TESTS
 
 } // namespace chronosync