Added check to make sure destination network address is zero, indicating a local destination (me) instead of a routed destination.

bacnet-stack/src/npdu.c

@@ -385,16 +385,19 @@ void npdu_handler(
         fprintf(stderr, "NPDU: Network Layer Message discarded!\n");
 #endif
     } else if ((apdu_offset > 0) && (apdu_offset <= pdu_len)) {
-        /* only handle the version that we know how to handle */
-        if (npdu_data.protocol_version == BACNET_PROTOCOL_VERSION)
+        if ((npdu_data.protocol_version == BACNET_PROTOCOL_VERSION) &&
+            (dest.net == 0)) {
+            /* only handle the version that we know how to handle */
+            /* and we are not a router, so ignore messages with
+               routing information cause they are not for us */
             apdu_handler(src, &pdu[apdu_offset],
                 (uint16_t) (pdu_len - apdu_offset));
+        }
     }
 
     return;
 }
 
-
 #ifdef TEST
 #include <assert.h>
 #include <string.h>