diff --git a/smartobject.py b/smartobject.py
index dd39adc..ece777a 100644
--- a/smartobject.py
+++ b/smartobject.py
@@ -135,6 +135,22 @@ class SmartObject(hass.Hass,LoggerInterface):
     # Called at the end of initialize() after all YAML args are processed.
     def on_initialize_smart_object(self): pass
 
+    # Presence simulation extension point.
+    # HomeAlarm can call this method by app name.
+    def start_presence_simulation(self, source_app=None, slot_name=None, payload=None):
+        self.log_error(
+            f"{self.name} does not implement start_presence_simulation "
+            f"(source_app={source_app}, slot_name={slot_name})"
+        )
+
+    # Presence simulation extension point.
+    # HomeAlarm can call this method by app name.
+    def stop_presence_simulation(self, source_app=None, slot_name=None, payload=None):
+        self.log_error(
+            f"{self.name} does not implement stop_presence_simulation "
+            f"(source_app={source_app}, slot_name={slot_name})"
+        )
+
     # ------------------------------------------------------------------
     # Dataset persistence helpers
     # ------------------------------------------------------------------