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

src/bacnet/basic/object/av.c

@@ -1725,6 +1725,38 @@ int Analog_Value_Alarm_Summary(
 }
 #endif /* defined(INTRINSIC_REPORTING) */
 
+/**
+ * @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 *Analog_Value_Context_Get(uint32_t object_instance)
+{
+    struct analog_value_descr *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 Analog_Value_Context_Set(uint32_t object_instance, void *context)
+{
+    struct analog_value_descr *pObject;
+
+    pObject = Keylist_Data(Object_List, object_instance);
+    if (pObject) {
+        pObject->Context = context;
+    }
+}
+
 /**
  * @brief Creates a Analog Value object
  * @param object_instance - object-instance number of the object