event
Specifies the System Properties that each IoT Hub message should contain. Changing this forces a new resource to be created. Possible values are message-id, sequence-number, to, absolute-expiry-time, iothub-enqueuedtime, correlation-id, user-id, iothub-ack, iothub-connection-device-id, iothub-connection-auth-generation-id and iothub-connection-auth-method.