Finished up the Network Layer Message handling (I hope).

Simplified the Router Table encoding (just based on DNETs).

bacnet-stack/include/bacenum.h

@@ -1463,4 +1463,16 @@ typedef enum BACnetEventTransitionBits {
     MAX_BACNET_EVENT_TRANSITION = 3
 } BACNET_EVENT_TRANSITION_BITS;
 
+/* The Network Reject Reasons  for NETWORK_MESSAGE_REJECT_MESSAGE_TO_NETWORK */
+typedef enum {
+    NETWORK_REJECT_UNKNOWN_ERROR = 0,
+    NETWORK_REJECT_NO_ROUTE = 1,
+    NETWORK_REJECT_ROUTER_BUSY = 2,
+    NETWORK_REJECT_UNKNOWN_MESSAGE_TYPE = 3,
+    NETWORK_REJECT_MESSAGE_TOO_LONG = 4,
+    /* Reasons this value or above we don't know about */
+    NETWORK_REJECT_REASON_INVALID
+} BACNET_NETWORK_REJECT_REASONS;
+
+
 #endif /* end of BACENUM_H */