Kasa KP125M basic emeter support (#560)

* Add KP125M basic emeter support.

* Reduce diff.

* PR Comments

README.md

@@ -137,6 +137,7 @@ If your device is unlisted but working, please open a pull request to update the
 * KP105
 * KP115
 * KP125
+* KP125M
 * KP401
 * EP10
 

kasa/tapo/tapoplug.py

@@ -5,7 +5,8 @@ from typing import Any, Dict, Optional, cast
 
 from ..credentials import Credentials
 from ..emeterstatus import EmeterStatus
-from ..smartdevice import DeviceType
+from ..modules import Emeter
+from ..smartdevice import DeviceType, requires_update
 from .tapodevice import TapoDevice
 
 _LOGGER = logging.getLogger(__name__)
@@ -24,6 +25,15 @@ class TapoPlug(TapoDevice):
     ) -> None:
         super().__init__(host, port=port, credentials=credentials, timeout=timeout)
         self._device_type = DeviceType.Plug
+        self.modules: Dict[str, Any] = {}
+        self.emeter_type = "emeter"
+        self.modules["emeter"] = Emeter(self, self.emeter_type)
+
+    @property  # type: ignore
+    @requires_update
+    def has_emeter(self) -> bool:
+        """Return that the plug has an emeter."""
+        return True
 
     async def update(self, update_children: bool = True):
         """Call the device endpoint and update the device data."""
@@ -52,17 +62,24 @@ class TapoPlug(TapoDevice):
     @property
     def emeter_realtime(self) -> EmeterStatus:
         """Get the emeter status."""
-        return EmeterStatus({"power_mw": self._energy.get("current_power")})
+        return EmeterStatus(
+            {
+                "power_mw": self._energy.get("current_power"),
+                "total": self._convert_energy_data(
+                    self._energy.get("today_energy"), 1 / 1000
+                ),
+            }
+        )
 
     @property
     def emeter_today(self) -> Optional[float]:
         """Get the emeter value for today."""
-        return None
+        return self._convert_energy_data(self._energy.get("today_energy"), 1 / 1000)
 
     @property
     def emeter_this_month(self) -> Optional[float]:
         """Get the emeter value for this month."""
-        return None
+        return self._convert_energy_data(self._energy.get("month_energy"), 1 / 1000)
 
     @property
     def on_since(self) -> Optional[datetime]:
@@ -71,3 +88,7 @@ class TapoPlug(TapoDevice):
             return None
         on_time = cast(float, self._info.get("on_time"))
         return datetime.now().replace(microsecond=0) - timedelta(seconds=on_time)
+
+    def _convert_energy_data(self, data, scale) -> Optional[float]:
+        """Return adjusted emeter information."""
+        return data if not data else data * scale