Add missing files

usecases/cem/cevc/public_scen58.go

@@ -0,0 +1,45 @@
+package cevc
+
+import (
+	"github.com/enbility/eebus-go/features/server"
+	"github.com/enbility/spine-go/model"
+)
+
+// Scenario 5 & 6
+
+// start sending heartbeat from the local CEM entity
+//
+// the heartbeat is started by default when a non 0 timeout is set in the service configuration
+func (e *CEVC) StartHeartbeat() {
+	if hm := e.LocalEntity.HeartbeatManager(); hm != nil {
+		_ = hm.StartHeartbeat()
+	}
+}
+
+// stop sending heartbeat from the local CEM entity
+func (e *CEVC) StopHeartbeat() {
+	if hm := e.LocalEntity.HeartbeatManager(); hm != nil {
+		hm.StopHeartbeat()
+	}
+}
+
+// Scenario 7 & 8
+
+// set the local operating state of the local cem entity
+//
+// parameters:
+//   - failureState: if true, the operating state is set to failure, otherwise to normal
+func (e *CEVC) SetOperatingState(failureState bool) error {
+	lf, err := server.NewDeviceDiagnosis(e.LocalEntity)
+	if err != nil {
+		return err
+	}
+
+	state := model.DeviceDiagnosisOperatingStateTypeNormalOperation
+	if failureState {
+		state = model.DeviceDiagnosisOperatingStateTypeFailure
+	}
+	lf.SetLocalOperatingState(state)
+
+	return nil
+}

usecases/cem/cevc/public_scen58_test.go

@@ -0,0 +1,11 @@
+package cevc
+
+func (s *CemCEVCSuite) Test_Heartbeat() {
+	s.sut.StartHeartbeat()
+
+	s.sut.StopHeartbeat()
+}
+
+func (s *CemCEVCSuite) Test_OperatingState() {
+	s.sut.SetOperatingState(true)
+}