Fix [bug#80] npdu_decode via deprecation (#447)

* Fix [bug#80] npdu_decode via deprecation

---------

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

src/bacnet/basic/npdu/h_routed_npdu.c

@@ -281,7 +281,7 @@ void routing_npdu_handler(
 
     /* only handle the version that we know how to handle */
     if (pdu[0] == BACNET_PROTOCOL_VERSION) {
-        apdu_offset = npdu_decode(&pdu[0], &dest, src, &npdu_data);
+        apdu_offset = bacnet_npdu_decode(pdu, pdu_len, &dest, src, &npdu_data);
         if (apdu_offset <= 0) {
             debug_printf("NPDU: Decoding failed; Discarded!\n");
         } else if (npdu_data.network_layer_message) {

src/bacnet/npdu.h

@@ -27,6 +27,7 @@
 #include <stdbool.h>
 #include <stdint.h>
 #include "bacnet/bacnet_stack_exports.h"
+#include "bacnet/basic/sys/platform.h"
 #include "bacnet/bacdef.h"
 #include "bacnet/bacenum.h"
 
@@ -98,6 +99,7 @@ extern "C" {
         BACNET_NPDU_DATA * dest,
         BACNET_NPDU_DATA * src);
 
+    BACNET_STACK_DEPRECATED("Use bacnet_npdu_decode() instead")
     BACNET_STACK_EXPORT
     int npdu_decode(
         uint8_t * npdu,