Add voltage and current monitoring to smart Devices (#1281)

kasa/smart/modules/energy.py

@@ -15,6 +15,12 @@ class Energy(SmartModule, EnergyInterface):
 
     REQUIRED_COMPONENT = "energy_monitoring"
 
+    async def _post_update_hook(self) -> None:
+        if "voltage_mv" in self.data.get("get_emeter_data", {}):
+            self._supported = (
+                self._supported | EnergyInterface.ModuleFeature.VOLTAGE_CURRENT
+            )
+
     def query(self) -> dict:
         """Query to execute during the update cycle."""
         req = {
@@ -22,13 +28,17 @@ class Energy(SmartModule, EnergyInterface):
         }
         if self.supported_version > 1:
             req["get_current_power"] = None
+            req["get_emeter_data"] = None
+            req["get_emeter_vgain_igain"] = None
         return req
 
     @property
     @raise_if_update_error
     def current_consumption(self) -> float | None:
         """Current power in watts."""
-        if (power := self.energy.get("current_power")) is not None:
+        if (power := self.energy.get("current_power")) is not None or (
+            power := self.data.get("get_emeter_data", {}).get("power_mw")
+        ) is not None:
             return power / 1_000
         # Fallback if get_energy_usage does not provide current_power,
         # which can happen on some newer devices (e.g. P304M).
@@ -58,7 +68,10 @@ class Energy(SmartModule, EnergyInterface):
     @raise_if_update_error
     def status(self) -> EmeterStatus:
         """Get the emeter status."""
-        return self._get_status_from_energy(self.energy)
+        if "get_emeter_data" in self.data:
+            return EmeterStatus(self.data["get_emeter_data"])
+        else:
+            return self._get_status_from_energy(self.energy)
 
     async def get_status(self) -> EmeterStatus:
         """Return real-time statistics."""
@@ -87,13 +100,15 @@ class Energy(SmartModule, EnergyInterface):
     @raise_if_update_error
     def current(self) -> float | None:
         """Return the current in A."""
-        return None
+        ma = self.data.get("get_emeter_data", {}).get("current_ma")
+        return ma / 1000 if ma else None
 
     @property
     @raise_if_update_error
     def voltage(self) -> float | None:
         """Get the current voltage in V."""
-        return None
+        mv = self.data.get("get_emeter_data", {}).get("voltage_mv")
+        return mv / 1000 if mv else None
 
     async def _deprecated_get_realtime(self) -> EmeterStatus:
         """Retrieve current energy readings."""