Try

Author: bouwew

plugwise_usb/connection/receiver.py

@@ -443,7 +443,7 @@ async def _notify_node_response_subscribers(
         for node_subscription in self._node_response_subscribers.values():
             if (
                 node_subscription.mac is not None
-                and node_subscription.mac != node_response.mac
+                and node_subscription.mac != node_response.mac if node_response.mac is not None else True
             ):
                 continue
             if (