Add Shelly1 (#2546)

charger/shelly.go

@@ -3,6 +3,7 @@ package charger
 import (
 	"errors"
 	"fmt"
+	"math"
 	"net/http"
 	"strings"
 
@@ -89,7 +90,11 @@ func NewShelly(uri, user, password string, channel int, standbypower float64) (*
 		}
 
 		if resp.NumMeters == 0 {
-			return c, fmt.Errorf("%s (%s) gen1 missing power meter ", resp.Model, resp.Mac)
+			// Shelly1 force static mode with fake power http://192.168.178.xxx/settings/power/0?power=standbypower+1
+			uri := fmt.Sprintf("%s/settings/power/%d?power=%d", c.uri, c.channel, int(math.Abs(c.standbypower)+1))
+			if err := c.GetJSON(uri, &resp); err != nil {
+				return c, err
+			}
 		}
 
 	case 2: