added feedback.lockDurationAsIso8601 setting and Azure Portal and CLI

Author: JimacoMS3

articles/iot-hub/iot-hub-devguide-messages-c2d.md

@@ -132,48 +132,34 @@ Each IoT hub exposes the following configuration options for cloud-to-device mes
 | defaultTtlAsIso8601       | Default TTL for cloud-to-device messages | ISO_8601 interval up to 2 days (minimum 1 minute); default: 1 hour |
 | maxDeliveryCount          | Maximum delivery count for cloud-to-device per-device queues | 1 to 100; default: 10 |
 | feedback.ttlAsIso8601     | Retention for service-bound feedback messages | ISO_8601 interval up to 2 days (minimum 1 minute); default: 1 hour |
-| feedback.maxDeliveryCount | Maximum delivery count for the feedback queue | 1 to 100; default: 100 |
-| feedback.lockDurationAsIso8601 | Maximum delivery count for the feedback queue | 5 to 300 seconds (minimum 5 seconds); default: 60 seconds. |
+| feedback.maxDeliveryCount | Maximum delivery count for the feedback queue | 1 to 100; default: 10 |
+| feedback.lockDurationAsIso8601 | Maximum delivery count for the feedback queue | ISO_8601 interval from 5 to 300 seconds (minimum 5 seconds); default: 60 seconds. |
 
 You can set the configuration options in one of the following ways:
 
-* **Azure portal**: Under **Settings** on your IoT hub, select **Built-in endpoints** and expand **Cloud to device messaging**. (Setting the **feedback.maxDeliveryCount** property is not currently supported in Azure portal.)
+* **Azure portal**: Under **Settings** on your IoT hub, select **Built-in endpoints** and expand **Cloud to device messaging**. (Setting the **feedback.maxDeliveryCount** and **feedback.lockDurationAsIso8601** properties is not currently supported in Azure portal.)
 
-* **Azure CLI**: Use the [az iot hub update](https://docs.microsoft.com/cli/azure/iot/hub?view=azure-cli-latest#az-iot-hub-update) command:
-
-    ```azurecli
-    az iot hub update --name {your IoT hub name} --c2d-ttl PT1H0M0S
-
-    az iot hub update --name {your IoT hub name} --c2d-max-delivery-count 10
-
-    az iot hub update --name {your IoT hub name} --feedback-ttl PT1H0M0S
-
-    az iot hub update --name {your IoT hub name} --feedback-max-delivery-count 100
+    ![Set configuration options for cloud-to-device messaging in the portal](./media/iot-hub-devguide-messages-c2d/c2d-configuration-portal.png)
 
-    az iot hub update --name {your IoT hub name} --feedback-lock-duration 60
-    ```
-
-    You can also use the generic `set` parameter to set configuration options:
+* **Azure CLI**: Use the [az iot hub update](https://docs.microsoft.com/cli/azure/iot/hub?view=azure-cli-latest#az-iot-hub-update) command:
 
     ```azurecli
     az iot hub update --name {your IoT hub name} \
-        --set properties.cloudToDevice.defaultTtlAsIso8601 PT1H0M0S
+        --set properties.cloudToDevice.defaultTtlAsIso8601=PT1H0M0S
 
     az iot hub update --name {your IoT hub name} \
-        --set properties.cloudToDevice.maxDeliveryCount 10
+        --set properties.cloudToDevice.maxDeliveryCount=10
 
     az iot hub update --name {your IoT hub name} \
-        --set properties.cloudToDevice.feedback.ttlAsIso8601 PT1H0M0S
+        --set properties.cloudToDevice.feedback.ttlAsIso8601=PT1H0M0S
 
     az iot hub update --name {your IoT hub name} \
-        --set properties.cloudToDevice.feedback.maxDeliveryCount 100
+        --set properties.cloudToDevice.feedback.maxDeliveryCount=10
 
     az iot hub update --name {your IoT hub name} \
-        --set properties.cloudToDevice.feedback.lockDurationAsIso8601 60
+        --set properties.cloudToDevice.feedback.lockDurationAsIso8601=PT0H1M0S
     ```
 
-
-
 ## Next steps
 
 For information about the SDKs that you can use to receive cloud-to-device messages, see [Azure IoT SDKs](iot-hub-devguide-sdks.md).