Added the ability to ask for the BVLC Function Code in the lower layers; particular need was to recognize bcasts and not respond with Reject-Message-to-Network.

bacnet-stack/include/bvlc.h

@@ -96,15 +96,21 @@ extern "C" {
 struct sockaddr_in;     /* Defined elsewhere, needed here. */
 
     /* Note any BVLC_RESULT code, or NAK the BVLL message in the unsupported cases. */
-    void bvlc_for_non_bbmd(     
+    int bvlc_for_non_bbmd(     
             struct sockaddr_in * sout,      
             uint8_t * npdu,     
             uint16_t received_bytes);
 
-    /** Returns the last BVLL Result we received, either as the result of a BBMD
+    /* Returns the last BVLL Result we received, either as the result of a BBMD
      * request we sent, or (if not a BBMD or Client), from trying to register 
      * as a foreign device. */
     BACNET_BVLC_RESULT bvlc_get_last_result();
+    
+    /* Returns the current BVLL Function Code we are processing.
+     * We have to store this higher layer code for when the lower layers
+     * need to know what it is, especially to differentiate between
+     * BVLC_ORIGINAL_UNICAST_NPDU and BVLC_ORIGINAL_BROADCAST_NPDU.  */
+    BACNET_BVLC_FUNCTION bvlc_get_function_code();
 
 #ifdef __cplusplus
 }