Resolve "Error handling in event publishing via entity services could be improved"

Description

See #248

controller/nucleus/deviceService.go

@@ -82,7 +82,12 @@ func (s *DeviceService) Add(deviceToAdd device.Device) error {
 
 	pubEvent := event.NewAddEvent(deviceToAdd.ID())
 	if err := s.eventService.PublishEvent(DeviceEventTopic, pubEvent); err != nil {
-		if retryErr := s.eventService.RetryPublish(DeviceEventTopic, pubEvent); retryErr != nil {
+		var retryErr error
+		go func() {
+			retryErr = s.eventService.RetryPublish(DeviceEventTopic, pubEvent)
+		}()
+
+		if retryErr != nil {
 			log.Error(retryErr)
 		}
 	}
@@ -116,7 +121,12 @@ func (s *DeviceService) UpdateModel(deviceToUpdate device.Device, modelAsString
 
 	pubEvent := event.NewUpdateEvent(deviceToUpdate.ID())
 	if err := s.eventService.PublishEvent(DeviceEventTopic, pubEvent); err != nil {
-		if retryErr := s.eventService.RetryPublish(DeviceEventTopic, pubEvent); retryErr != nil {
+		var retryErr error
+		go func() {
+			retryErr = s.eventService.RetryPublish(DeviceEventTopic, pubEvent)
+		}()
+
+		if retryErr != nil {
 			log.Error(retryErr)
 		}
 	}
@@ -133,7 +143,12 @@ func (s *DeviceService) Update(deviceToUpdate device.Device) error {
 
 	pubEvent := event.NewUpdateEvent(deviceToUpdate.ID())
 	if err := s.eventService.PublishEvent(DeviceEventTopic, pubEvent); err != nil {
-		if retryErr := s.eventService.RetryPublish(DeviceEventTopic, pubEvent); retryErr != nil {
+		var retryErr error
+		go func() {
+			retryErr = s.eventService.RetryPublish(DeviceEventTopic, pubEvent)
+		}()
+
+		if retryErr != nil {
 			log.Error(retryErr)
 		}
 	}
@@ -156,7 +171,12 @@ func (s *DeviceService) Delete(deviceToDelete device.Device) error {
 
 	pubEvent := event.NewDeleteEvent(deviceToDelete.ID())
 	if err := s.eventService.PublishEvent(DeviceEventTopic, pubEvent); err != nil {
-		if retryErr := s.eventService.RetryPublish(DeviceEventTopic, pubEvent); retryErr != nil {
+		var retryErr error
+		go func() {
+			retryErr = s.eventService.RetryPublish(DeviceEventTopic, pubEvent)
+		}()
+
+		if retryErr != nil {
 			log.Error(retryErr)
 		}
 	}