Try 2

Author: bouwew

plugwise_usb/messages/__init__.py

@@ -50,10 +50,10 @@ def identifier(self) -> bytes:
         return self._identifier
 
     @property
-    def mac(self) -> bytes:
+    def mac(self) -> bytes | None:
         """Return mac in bytes."""
-        if self._mac is None:
-            raise MessageError("Mac not set")
+        # if self._mac is None:
+        #     raise MessageError("Mac not set")
         return self._mac
 
     @property