hue driver can set stuff now, I hope

device/state.go

@@ -14,6 +14,13 @@ type State struct {
 	Color       *color.Color `json:"color"`
 }
 
+func (s State) Empty() bool {
+	return s.Power == nil &&
+		s.Temperature == nil &&
+		s.Intensity == nil &&
+		s.Color == nil
+}
+
 func (s State) String() string {
 	parts := make([]string, 0, 4)
 	if s.Power != nil {