Kathrein: fix RFID (#23608)

charger/kathrein.go

@@ -399,19 +399,39 @@ func (wb *Kathrein) GetPhases() (int, error) {
 	}
 }
 
+var _ api.StatusReasoner = (*Kathrein)(nil)
+
+// StatusReason implements the api.StatusReasoner interface
+func (wb *Kathrein) StatusReason() (api.Reason, error) {
+	res := api.ReasonUnknown
+
+	b, err := wb.conn.ReadHoldingRegisters(kathreinRegChargingState, 1)
+	if err == nil && binary.BigEndian.Uint16(b) == 2 {
+		res = api.ReasonWaitingForAuthorization
+	}
+
+	return res, err
+}
+
 var _ api.Identifier = (*Kathrein)(nil)
 
 // Identify implements the api.Identifier interface
 func (wb *Kathrein) Identify() (string, error) {
-	b, err := wb.conn.ReadHoldingRegisters(kathreinRegRfid, 16)
+	s, err := wb.conn.ReadHoldingRegisters(kathreinRegChargingState, 1)
 	if err != nil {
 		return "", err
 	}
 
-	if string(b) == "VOID" {
+	state := binary.BigEndian.Uint16(s)
+	if state < 3 || state > 6 {
 		return "", nil
 	}
 
+	b, err := wb.conn.ReadHoldingRegisters(kathreinRegRfid, 16)
+	if err != nil {
+		return "", err
+	}
+
 	return string(b), nil
 }
 

templates/definition/charger/kathrein.yaml

@@ -1,4 +1,4 @@
-template: Kathrein
+template: kathrein
 products:
   - brand: Kathrein
     description: