Added enhancement to address cache: Top Protected Entry: entries from 0 to Top_Protected_Entry are not removed by address_remove_oldest()function. When I-am attack occurs only entries between Top_Protected_Entry and MAX_ADDRESS_CACHE can be removed.

bacnet-stack/include/address.h

@@ -59,6 +59,13 @@ extern "C" {
         unsigned *max_apdu,
         BACNET_ADDRESS * src);
 
+    bool address_device_get_by_index(
+        unsigned index,
+        uint32_t * device_id,
+        uint32_t * device_ttl,
+        unsigned *max_apdu,
+        BACNET_ADDRESS * src);
+
     bool address_get_device_id(
         BACNET_ADDRESS * src,
         uint32_t * device_id);
@@ -75,6 +82,12 @@ extern "C" {
         unsigned *max_apdu,
         BACNET_ADDRESS * src);
 
+    bool address_device_bind_request(
+        uint32_t device_id,
+        uint32_t * device_ttl,
+        unsigned *max_apdu,
+        BACNET_ADDRESS * src);
+
     void address_add_binding(
         uint32_t device_id,
         unsigned max_apdu,
@@ -105,6 +118,9 @@ extern "C" {
         BACNET_MAC_ADDRESS *mac,
         char *arg);
 
+    void address_protected_entry_index_set(uint32_t top_protected_entry_index);
+    void address_own_device_id_set(uint32_t own_id);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */