Added a context variable in basic object data structure and API to get or set the context pointer. (#1111)

src/bacnet/basic/object/auditlog.c

@@ -103,6 +103,7 @@ struct object_data {
     int Record_Count_Total;
     const char *Object_Name;
     const char *Description;
+    void *Context;
 };
 /* Key List for storing the object data sorted by instance number  */
 static OS_Keylist Object_List;
@@ -1378,6 +1379,38 @@ int Audit_Log_Read_Range_By_Time(BACNET_READ_RANGE_DATA *pRequest)
     return apdu_len;
 }
 
+/**
+ * @brief Set the context used with a specific object instance
+ * @param object_instance [in] BACnet object instance number
+ * @param context [in] pointer to the context
+ */
+void *Audit_Log_Context_Get(uint32_t object_instance)
+{
+    struct object_data *pObject;
+
+    pObject = Keylist_Data(Object_List, object_instance);
+    if (pObject) {
+        return pObject->Context;
+    }
+
+    return NULL;
+}
+
+/**
+ * @brief Set the context used with a specific object instance
+ * @param object_instance [in] BACnet object instance number
+ * @param context [in] pointer to the context
+ */
+void Audit_Log_Context_Set(uint32_t object_instance, void *context)
+{
+    struct object_data *pObject;
+
+    pObject = Keylist_Data(Object_List, object_instance);
+    if (pObject) {
+        pObject->Context = context;
+    }
+}
+
 /**
  * @brief Creates a Audit Log object
  * @param object_instance - object-instance number of the object