Downstream messages are sent from the backend to the devices.
| Name | Type | Description | Notes |
|---|---|---|---|
| messageId | String | [optional] | |
| collectionId | String | [optional] | |
| deviceId | String | [optional] | |
| gatewayId | String | [optional] | |
| createdTime | String | [optional] | |
| sentTime | String | [optional] | |
| transport | MessageTransport | [optional] | |
| state | MessageState | [optional] | |
| payload | byte[] | [optional] |