Index: firmware/App/Services/Messaging.c
===================================================================
diff -u -re7528bc3938f0ef6e05960045e24dc91ac87f344 -r51d83f99e63d9cb52951097996641cc5b3ddffd7
--- firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision e7528bc3938f0ef6e05960045e24dc91ac87f344)
+++ firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision 51d83f99e63d9cb52951097996641cc5b3ddffd7)
@@ -325,7 +325,7 @@
         }
     }
     // ACK/NAK request
-    if ( message->hdr.msgID < MSG_ID_FIRST_DD_TESTER_MESSAGE )
+    if ( message->hdr.msgID < MSG_ID_FIRST_TD_TESTER_MESSAGE )
     {
         if ( respBuffer != COMM_BUFFER_NOT_USED )
         {