BLE: Add function to querry the list of identity addresses present in the SecureDB.

features/FEATURE_BLE/ble/pal/MemorySecurityDB.h

@@ -187,6 +187,22 @@ public:
         }
     }
 
+    virtual void get_identity_list(
+        IdentitylistDbCb_t cb,
+        ArrayView<SecurityEntryIdentity_t*>& entries
+    ) {
+        size_t count = 0;
+        for (size_t i = 0; i < MAX_ENTRIES && count < entries.size(); ++i) {
+            entry_t& e = _entries[i];
+
+            if (e.state == ENTRY_WRITTEN && e.flags.irk_stored) {
+                entries[count] = &e.peer_identity;
+                ++count;
+            }
+        }
+
+        cb(entries, count);
+    }
 
     /* set */
 

features/FEATURE_BLE/ble/pal/SecurityDb.h

@@ -107,6 +107,8 @@ public:
         SecurityEntryCsrkDbCb_t;
     typedef mbed::Callback<void(entry_handle_t, const SecurityEntryIdentity_t*)>
         SecurityEntryIdentityDbCb_t;
+    typedef mbed::Callback<void(ArrayView<SecurityEntryIdentity_t*>&, size_t count)>
+        IdentitylistDbCb_t;
     typedef mbed::Callback<void(::Gap::Whitelist_t*)>
         WhitelistDbCb_t;
 
@@ -274,6 +276,20 @@ public:
         entry_handle_t db_entry
     ) = 0;
 
+    /**
+     * Asynchronously return the identity list stored in NVM through a callback.
+     * Function takes ownership of the memory. The identity list and the
+     * ownership will be returned in the callback.
+     *
+     * @param[in] cb callback that will receive the whitelist
+     * @param[in] identity_list preallocated identity_list that will be filled
+     * in.
+     */
+    virtual void get_identity_list(
+        IdentitylistDbCb_t cb,
+        ArrayView<SecurityEntryIdentity_t*>& identity_list
+    ) = 0;
+
     /**
      * Update peer signing key.
      *