EEBus: error on missing productionNominalMax (BC) (#31483)

hems/eebus/eebus.go

@@ -2,6 +2,7 @@ package eebus
 
 import (
 	"context"
+	"errors"
 	"sync"
 	"time"
 
@@ -246,6 +247,10 @@ func (c *EEBus) run() error {
 	// LPP
 	if c.productionLimitActivated.IsZero() {
 		if c.productionLimit.IsActive {
+			if c.productionNominalMax <= 0 {
+				return errors.New("production limit received but productionNominalMax is not configured")
+			}
+
 			c.log.WARN.Println("activating production limit")
 			c.setProductionLimit(c.productionLimit.Value, true)
 		}

hems/eebus/eebus_test.go

@@ -150,6 +150,18 @@ func TestRun_ProductionLimitReleasedEarly(t *testing.T) {
 	assertProductionLimit(t, c, false)
 }
 
+// TestRun_ProductionLimitWithoutNominalMax verifies an incoming LPP limit
+// errors instead of being silently ignored when productionNominalMax is unset (#31469).
+func TestRun_ProductionLimitWithoutNominalMax(t *testing.T) {
+	c := newTestEEBus(t)
+	c.heartbeat.Set(struct{}{})
+	c.productionNominalMax = 0
+
+	c.productionLimit = ucapi.LoadLimit{Value: -2200, IsActive: true, Duration: time.Hour}
+	require.Error(t, c.run())
+	assert.Nil(t, c.CurtailedPercent())
+}
+
 // TestRun_ConsumptionLimitReleasedEarly is the LPC mirror of the LPP early-release
 // case: an active consumption limit must drop as soon as the EG deactivates it.
 func TestRun_ConsumptionLimitReleasedEarly(t *testing.T) {