fix: support emeter key with units

Fix #1

Author: fffonion

kasa/emeter.go

@@ -8,15 +8,35 @@ type GetRealtimeRequest struct {
 }
 
 type GetRealtimeResponse struct {
-	Current float64 `mapstructure:"current_ma"`
-	Voltage float64 `mapstructure:"voltage_mv"`
-	Power   float64 `mapstructure:"power_mw"`
-	Total   float64 `mapstructure:"total_wh"`
+	// some fw/hw may use the following keys
+	Current float64 `mapstructure:"current"` // unit is A
+	Voltage float64 `mapstructure:"voltage"` // unit is V
+	Power   float64 `mapstructure:"power"`   // unit is W
+	Total   float64 `mapstructure:"total"`   // unit is kWh
+
+	// some may use these
+	CurrentmA float64 `mapstructure:"current_ma"`
+	VoltagemV float64 `mapstructure:"voltage_mv"`
+	PowermW   float64 `mapstructure:"power_mw"`
+	TotalWh   float64 `mapstructure:"total_wh"`
+}
+
+func (r *GetRealtimeResponse) Normalize() {
+	if r.TotalWh != -1 {
+		r.Current = r.CurrentmA / 1000
+		r.Voltage = r.VoltagemV / 1000
+		r.Power = r.PowermW / 1000
+		r.Total = r.TotalWh / 1000
+	}
 }
 
 func (s *KasaClientEmeterService) GetRealtime() (*GetRealtimeResponse, error) {
-	var response GetRealtimeResponse
+	response := GetRealtimeResponse{
+		TotalWh: -1,
+	}
 	err := s.c.RPC("emeter", "get_realtime", GetRealtimeRequest{}, &response)
 
+	response.Normalize()
+
 	return &response, err
 }

kasa/kasa.go

@@ -13,7 +13,6 @@ import (
 type KasaClient struct {
 	addr  string
 	model string
-	conn  *net.Conn
 }
 
 type KasaClientConfig struct {