Merge pull request #104336 from JimacoMS3/gh-issue-44858-builtin-endpoint-settings

added info about changing c2d configuration options

Author: v-albemi

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

@@ -132,9 +132,33 @@ 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.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. |
 
-For more information about how to set these configuration options, see [Create IoT hubs](iot-hub-create-through-portal.md).
+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** and **feedback.lockDurationAsIso8601** properties is not currently supported in Azure portal.)
+
+    ![Set configuration options for cloud-to-device messaging in the portal](./media/iot-hub-devguide-messages-c2d/c2d-configuration-portal.png)
+
+* **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
+
+    az iot hub update --name {your IoT hub name} \
+        --set properties.cloudToDevice.maxDeliveryCount=10
+
+    az iot hub update --name {your IoT hub name} \
+        --set properties.cloudToDevice.feedback.ttlAsIso8601=PT1H0M0S
+
+    az iot hub update --name {your IoT hub name} \
+        --set properties.cloudToDevice.feedback.maxDeliveryCount=10
+
+    az iot hub update --name {your IoT hub name} \
+        --set properties.cloudToDevice.feedback.lockDurationAsIso8601=PT0H1M0S
+    ```
 
 ## Next steps