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

src/bacnet/basic/object/bo.c

@@ -46,6 +46,7 @@ struct object_data {
     const char *Active_Text;
     const char *Inactive_Text;
     const char *Description;
+    void *Context;
 };
 /* Key List for storing the object data sorted by instance number  */
 static OS_Keylist Object_List;
@@ -1242,6 +1243,38 @@ void Binary_Output_Write_Present_Value_Callback_Set(
     Binary_Output_Write_Present_Value_Callback = cb;
 }
 
+/**
+ * @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 *Binary_Output_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 Binary_Output_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 Binary Output object
  * @param object_instance - object-instance number of the object