EEbus: let loadpoint rewrite currents on connection (#9921)

charger/eebus.go

@@ -33,6 +33,10 @@ type EEBus struct {
 	expectedEnableUnpluggedState bool
 	current                      float64
 
+	// connection tracking for api.CurrentGetter
+	evConnected  bool
+	currentLimit float64
+
 	lastIsChargingCheck  time.Time
 	lastIsChargingResult bool
 
@@ -231,9 +235,15 @@ func (c *EEBus) updateState() (api.ChargeStatus, error) {
 
 	if !c.emobility.EVConnected() {
 		c.expectedEnableUnpluggedState = false
+		c.evConnected = false
 		return api.StatusA, nil
 	}
 
+	if !c.evConnected {
+		c.evConnected = true
+		c.currentLimit = -1
+	}
+
 	currentState, err := c.emobility.EVCurrentChargeState()
 	if err != nil {
 		return api.StatusNone, err
@@ -349,7 +359,11 @@ func (c *EEBus) writeCurrentLimitData(currents []float64) error {
 
 	// Set overload protection limits and self consumption limits to identical values,
 	// so if the EV supports self consumption it will be used automatically.
-	return c.emobility.EVWriteLoadControlLimits(currents, currents)
+	if err = c.emobility.EVWriteLoadControlLimits(currents, currents); err == nil {
+		c.currentLimit = currents[0]
+	}
+
+	return err
 }
 
 // MaxCurrent implements the api.Charger interface
@@ -374,6 +388,13 @@ func (c *EEBus) MaxCurrentMillis(current float64) error {
 	return nil
 }
 
+var _ api.CurrentGetter = (*Easee)(nil)
+
+// GetMaxCurrent implements the api.CurrentGetter interface
+func (c *EEBus) GetMaxCurrent() (float64, error) {
+	return c.currentLimit, nil
+}
+
 // CurrentPower implements the api.Meter interface
 func (c *EEBus) currentPower() (float64, error) {
 	if !c.emobility.EVConnected() {