This event is triggered when a GATT Server application is registered using `esp_ble_gatts_app_register`.
This event is triggered when the read request from the Client is received.
This event is triggered when the write request from the Client is received.
This event is triggered when the write execution request from the Client is received.
This event is triggered when the MTU configuration request from the Client is received.
This event is triggered when the confirmation from the Client is received.
This event is triggered when a GATT Server application is unregistered using `esp_ble_gatts_app_unregister`.
This event is triggered when a GATT Server service is created using `esp_ble_gatts_create_service`.
This event is triggered when an included service is added using `esp_ble_gatts_add_included_service`.
This event is triggered when a characteristic is added to the service using `esp_ble_gatts_add_char`.
This event is triggered when a characteristic descriptor is added to the service using `esp_ble_gatts_add_char_descr`.
This event is triggered when the service is deleted using `esp_ble_gatts_delete_service`.
This event is triggered when the service is started using `esp_ble_gatts_start_service`.
This event is triggered when the service is stopped using `esp_ble_gatts_stop_service`.
This event is triggered when a physical connection is set up.
This event is triggered when a physical connection is terminated.
This event is triggered when a virtual connection is created using `esp_ble_gatts_open`.
This event is triggered when a virtual connection is closed using `esp_ble_gatts_close`.
This event is triggered when the GATT connection is congested.
This event is triggered when a response is sent to the request using `esp_ble_gatts_send_response`.
This event is triggered when a service attribute table is created using `esp_ble_gatts_create_attr_tab`.
This event is triggered when an attribute value is set using `esp_ble_gatts_set_attr_value`.
This event is triggered when a service change indication is sent using `esp_ble_gatts_send_service_change_indication`.