Fix access to embedded status containers (#1682)

Also, implement __dir__ to enable autocompletion for attributes of embedded containers.

miio/devicestatus.py

@@ -5,6 +5,7 @@
 from typing import (
     Callable,
     Dict,
+    Iterable,
     Optional,
     Type,
     Union,
@@ -124,11 +125,23 @@ def embed(self, other: "DeviceStatus"):
             final_name = f"{other_name}__{name}"
             self._settings[final_name] = attr.evolve(setting, property=final_name)
 
+    def __dir__(self) -> Iterable[str]:
+        """Overridden to include properties from embedded containers."""
+        return (
+            list(super().__dir__())
+            + list(self._embedded)
+            + list(self._sensors)
+            + list(self._settings)
+        )
+
     def __getattr__(self, item):
         """Overridden to lookup properties from embedded containers."""
         if item.startswith("__") and item.endswith("__"):
             return super().__getattribute__(item)
 
+        if item in self._embedded:
+            return self._embedded[item]
+
         embed, prop = item.split("__", maxsplit=1)
         if not embed or not prop:
             return super().__getattribute__(item)

miio/tests/test_devicestatus.py

@@ -278,3 +278,10 @@ def sub_sensor(self):
         repr(main)
         == "<MainStatus main_sensor=main SubStatus=<SubStatus sub_sensor=sub>>"
     )
+
+    # Test attribute access to the sub status
+    assert isinstance(main.SubStatus, SubStatus)
+
+    # Test that __dir__ is implemented correctly
+    assert "SubStatus" in dir(main)
+    assert "SubStatus__sub_sensor" in dir(main)