Gracefully handle when remaining time estimate is not available

api/error.go

@@ -0,0 +1,6 @@
+package api
+
+import "errors"
+
+// ErrNotAvailable indicates that a feature is not available
+var ErrNotAvailable = errors.New("not available")

core/wrapper/socestimator.go

@@ -1,6 +1,7 @@
 package wrapper
 
 import (
+	"errors"
 	"math"
 	"time"
 
@@ -63,7 +64,9 @@ func (s *SocEstimator) RemainingChargeDuration(chargePower float64, targetSoC in
 				return time.Duration(float64(timeRemaining) * percentRemaining / (100 - s.socCharge))
 			}
 
-			s.log.WARN.Printf("updating remaining time failed: %v", err)
+			if !errors.Is(err, api.ErrNotAvailable) {
+				s.log.WARN.Printf("updating remaining time failed: %v", err)
+			}
 		}
 
 		// estimate remaining time

vehicle/renault.go

@@ -333,7 +333,7 @@ func (v *Renault) finishTime() (time.Time, error) {
 	}
 
 	if kr.Data.Attributes.RemainingTime == nil {
-		return time.Time{}, errors.New("estimate not available")
+		return time.Time{}, api.ErrNotAvailable
 	}
 
 	return timestamp.Add(time.Duration(*kr.Data.Attributes.RemainingTime) * time.Minute), err