# MQTT Eventing
This feature provides hierarchical MQTT eventing for a multitude of events:

| Event                   | Topic                                                                                             | Payload                      |
| ----------------------- | ------------------------------------------------------------------------------------------------- | ---------------------------- |
| Submodel Created        | sm-repository/$repoId/submodels/created                                                           | Created SM JSON              |
| Submodel Updated        | sm-repository/$repoId/submodels/updated                                                           | Updated SM JSON              |
| Submodel Deleted        | sm-repository/$repoId/submodels/deleted                                                           | Deleted SM JSON              |
| SubmodelElement Created | sm-repository/$repoId/submodels/$submodelIdBase64URLEncoded/submodelElements/$idShortPath/created | Created SubmodelElement JSON |
| SubmodelElement Updated | sm-repository/$repoId/submodels/$submodelIdBase64URLEncoded/submodelElements/$idShortPath/updated | Updated SubmodelElement JSON |
| SubmodelElement Deleted | sm-repository/$repoId/submodels/$submodelIdBase64URLEncoded/submodelElements/$idShortPath/deleted | Deleted SubmodelElement JSON |
| SubmodelElements Patched | sm-repository/$repoId/submodels/$submodelIdBase64URLEncoded/submodelElements/patched | Patched SubmodelElements JSON |
| FileValue Updated | sm-repository/$repoId/submodels/$submodelIdBase64URLEncoded/submodelElements/$idShortPath/attachment/updated | Updated SubmodelElement JSON |
| FileValue Deleted | sm-repository/$repoId/submodels/$submodelIdBase64URLEncoded/submodelElements/$idShortPath/attachment/deleted | Deleted SubmodelElement JSON |

Per default, the SubmodelElement topic payloads include the SubmodelElement's value. If this is not desired, the SubmodelElement can be annotated with a Qualifier of type *emptyValueUpdateEvent* and value *true*