Move has_emeter to device level for multiple plug outlets (#41)

kasa/smartdevice.py

@@ -155,13 +155,17 @@ class SmartDevice:
 
         return result
 
+    @property  # type: ignore
+    @requires_update
     def has_emeter(self) -> bool:
-        """Return if device has an energy meter.
+        """Return whether device has an energy meter.
 
-        :return: True if energey meter is available
-                 False if energymeter is missing
+        :return: True if energy meter is available
+                 False otherwise
         """
-        raise NotImplementedError()
+        sys_info = self.sys_info
+        features = sys_info["feature"].split(":")
+        return "ENE" in features
 
     async def get_sys_info(self) -> Dict[str, Any]:
         """Retrieve system information.

kasa/smartplug.py

@@ -92,18 +92,6 @@ class SmartPlug(SmartDevice):
         sys_info = self.sys_info
         return "brightness" in sys_info
 
-    @property  # type: ignore
-    @requires_update
-    def has_emeter(self):
-        """Return whether device has an energy meter.
-
-        :return: True if energy meter is available
-                 False otherwise
-        """
-        sys_info = self.sys_info
-        features = sys_info["feature"].split(":")
-        return "ENE" in features
-
     @property  # type: ignore
     @requires_update
     def is_on(self) -> bool:

kasa/smartstrip.py

@@ -45,10 +45,6 @@ class SmartStrip(SmartDevice):
     and should be handled by the user of the library.
     """
 
-    def has_emeter(self) -> bool:
-        """Return True as strips has always an emeter."""
-        return True
-
     def __init__(self, host: str, *, cache_ttl: int = 3) -> None:
         super().__init__(host=host)
         self.emeter_type = "emeter"
@@ -281,12 +277,6 @@ class SmartStripPlug(SmartPlug):
         """
         return f"{self.mac}_{self.child_id}"
 
-    @property  # type: ignore
-    @requires_update
-    def has_emeter(self):
-        """Single sockets have always an emeter."""
-        return True
-
     @property  # type: ignore
     @requires_update
     def alias(self) -> str: