diff --git a/lib/services/iothub/lib/iotHubClient.js b/lib/services/iothub/lib/iotHubClient.js
index 389702b2f9..14b9d7dac0 100644
--- a/lib/services/iothub/lib/iotHubClient.js
+++ b/lib/services/iothub/lib/iotHubClient.js
@@ -50,7 +50,7 @@ class IotHubClient extends ServiceClient {
 
     super(credentials, options);
 
-    this.apiVersion = '2018-04-01';
+    this.apiVersion = '2018-12-01-preview';
     this.acceptLanguage = 'en-US';
     this.longRunningOperationRetryTimeout = 30;
     this.generateClientRequestId = true;
diff --git a/lib/services/iothub/lib/models/index.d.ts b/lib/services/iothub/lib/models/index.d.ts
index 74637e91ff..b7c36696bd 100644
--- a/lib/services/iothub/lib/models/index.d.ts
+++ b/lib/services/iothub/lib/models/index.d.ts
@@ -347,7 +347,7 @@ export interface RoutingEventHubProperties {
  * written to storage. Value should be between 10485760(10MB) and
  * 524288000(500MB). Default value is 314572800(300MB).
  * @member {string} [encoding] Encoding that is used to serialize messages to
- * blobs. Supported values are 'avro' and 'avroDeflate'. Default value is
+ * blobs. Supported values are 'avro' and 'avrodeflate'. Default value is
  * 'avro'.
  */
 export interface RoutingStorageContainerProperties {
@@ -498,7 +498,7 @@ export interface RoutingProperties {
  * The properties of the Azure Storage endpoint for file upload.
  *
  * @member {moment.duration} [sasTtlAsIso8601] The period of time for which the
- * SAS URI generated by IoT Hub for file upload is valid. See:
+ * the SAS URI generated by IoT Hub for file upload is valid. See:
  * https://docs.microsoft.com/azure/iot-hub/iot-hub-devguide-file-upload#file-upload-notification-configuration-options.
  * @member {string} connectionString The connection string for the Azure
  * Storage account to which files are uploaded.
@@ -600,6 +600,18 @@ export interface OperationsMonitoringProperties {
   events?: { [propertyName: string]: string };
 }
 
+/**
+ * @class
+ * Initializes a new instance of the IotHubPropertiesDeviceStreams class.
+ * @constructor
+ * The device streams properties of iothub.
+ *
+ * @member {array} [streamingEndpoints] List of Device Streams Endpoints.
+ */
+export interface IotHubPropertiesDeviceStreams {
+  streamingEndpoints?: string[];
+}
+
 /**
  * @class
  * Initializes a new instance of the IotHubProperties class.
@@ -610,7 +622,7 @@ export interface OperationsMonitoringProperties {
  * use to secure a connection to the IoT hub.
  * @member {array} [ipFilterRules] The IP filter rules.
  * @member {string} [provisioningState] The provisioning state.
- * @member {string} [state] The hub state.
+ * @member {string} [state] Thehub state state.
  * @member {string} [hostName] The name of the host.
  * @member {object} [eventHubEndpoints] The Event Hub-compatible endpoint
  * properties. The possible keys to this dictionary are events and
@@ -682,6 +694,9 @@ export interface OperationsMonitoringProperties {
  * @member {string} [comments] IoT hub comments.
  * @member {object} [operationsMonitoringProperties]
  * @member {object} [operationsMonitoringProperties.events]
+ * @member {object} [deviceStreams] The device streams properties of iothub.
+ * @member {array} [deviceStreams.streamingEndpoints] List of Device Streams
+ * Endpoints.
  * @member {string} [features] The capabilities and features enabled for the
  * IoT hub. Possible values include: 'None', 'DeviceManagement'
  */
@@ -699,6 +714,7 @@ export interface IotHubProperties {
   cloudToDevice?: CloudToDeviceProperties;
   comments?: string;
   operationsMonitoringProperties?: OperationsMonitoringProperties;
+  deviceStreams?: IotHubPropertiesDeviceStreams;
   features?: string;
 }
 
@@ -755,7 +771,7 @@ export interface Resource extends BaseResource {
  * policies you can use to secure a connection to the IoT hub.
  * @member {array} [properties.ipFilterRules] The IP filter rules.
  * @member {string} [properties.provisioningState] The provisioning state.
- * @member {string} [properties.state] The hub state.
+ * @member {string} [properties.state] Thehub state state.
  * @member {string} [properties.hostName] The name of the host.
  * @member {object} [properties.eventHubEndpoints] The Event Hub-compatible
  * endpoint properties. The possible keys to this dictionary are events and
@@ -831,6 +847,10 @@ export interface Resource extends BaseResource {
  * @member {string} [properties.comments] IoT hub comments.
  * @member {object} [properties.operationsMonitoringProperties]
  * @member {object} [properties.operationsMonitoringProperties.events]
+ * @member {object} [properties.deviceStreams] The device streams properties of
+ * iothub.
+ * @member {array} [properties.deviceStreams.streamingEndpoints] List of Device
+ * Streams Endpoints.
  * @member {string} [properties.features] The capabilities and features enabled
  * for the IoT hub. Possible values include: 'None', 'DeviceManagement'
  * @member {object} sku IotHub SKU info
@@ -857,11 +877,13 @@ export interface IotHubDescription extends Resource {
  * @member {string} [provider] Service provider: Microsoft Devices
  * @member {string} [resource] Resource Type: IotHubs
  * @member {string} [operation] Name of the operation
+ * @member {string} [description] Description of the operation
  */
 export interface OperationDisplay {
   readonly provider?: string;
   readonly resource?: string;
   readonly operation?: string;
+  readonly description?: string;
 }
 
 /**
@@ -876,6 +898,7 @@ export interface OperationDisplay {
  * @member {string} [display.provider] Service provider: Microsoft Devices
  * @member {string} [display.resource] Resource Type: IotHubs
  * @member {string} [display.operation] Name of the operation
+ * @member {string} [display.description] Description of the operation
  */
 export interface Operation {
   readonly name?: string;
@@ -1163,12 +1186,12 @@ export interface RoutingMessage {
  * @class
  * Initializes a new instance of the RoutingTwinProperties class.
  * @constructor
- * @member {object} [desiredProperties] Twin desired properties
- * @member {object} [reportedProperties] Twin desired properties
+ * @member {object} [desired] Twin desired properties
+ * @member {object} [reported] Twin desired properties
  */
 export interface RoutingTwinProperties {
-  desiredProperties?: any;
-  reportedProperties?: any;
+  desired?: any;
+  reported?: any;
 }
 
 /**
@@ -1179,8 +1202,8 @@ export interface RoutingTwinProperties {
  *
  * @member {object} [tags] Twin Tags
  * @member {object} [properties]
- * @member {object} [properties.desiredProperties] Twin desired properties
- * @member {object} [properties.reportedProperties] Twin desired properties
+ * @member {object} [properties.desired] Twin desired properties
+ * @member {object} [properties.reported] Twin desired properties
  */
 export interface RoutingTwin {
   tags?: any;
@@ -1203,9 +1226,8 @@ export interface RoutingTwin {
  * @member {object} [twin] Routing Twin Reference
  * @member {object} [twin.tags] Twin Tags
  * @member {object} [twin.properties]
- * @member {object} [twin.properties.desiredProperties] Twin desired properties
- * @member {object} [twin.properties.reportedProperties] Twin desired
- * properties
+ * @member {object} [twin.properties.desired] Twin desired properties
+ * @member {object} [twin.properties.reported] Twin desired properties
  */
 export interface TestAllRoutesInput {
   routingSource?: string;
@@ -1283,9 +1305,8 @@ export interface TestAllRoutesResult {
  * @member {object} [twin] Routing Twin Reference
  * @member {object} [twin.tags] Twin Tags
  * @member {object} [twin.properties]
- * @member {object} [twin.properties.desiredProperties] Twin desired properties
- * @member {object} [twin.properties.reportedProperties] Twin desired
- * properties
+ * @member {object} [twin.properties.desired] Twin desired properties
+ * @member {object} [twin.properties.reported] Twin desired properties
  */
 export interface TestRouteInput {
   message?: RoutingMessage;
diff --git a/lib/services/iothub/lib/models/index.js b/lib/services/iothub/lib/models/index.js
index 2eb1273103..b2821c5d2a 100644
--- a/lib/services/iothub/lib/models/index.js
+++ b/lib/services/iothub/lib/models/index.js
@@ -41,6 +41,7 @@ exports.MessagingEndpointProperties = require('./messagingEndpointProperties');
 exports.FeedbackProperties = require('./feedbackProperties');
 exports.CloudToDeviceProperties = require('./cloudToDeviceProperties');
 exports.OperationsMonitoringProperties = require('./operationsMonitoringProperties');
+exports.IotHubPropertiesDeviceStreams = require('./iotHubPropertiesDeviceStreams');
 exports.IotHubProperties = require('./iotHubProperties');
 exports.IotHubSkuInfo = require('./iotHubSkuInfo');
 exports.Resource = require('./resource');
diff --git a/lib/services/iothub/lib/models/iotHubDescription.js b/lib/services/iothub/lib/models/iotHubDescription.js
index 024bfecbb7..50c8757aa3 100644
--- a/lib/services/iothub/lib/models/iotHubDescription.js
+++ b/lib/services/iothub/lib/models/iotHubDescription.js
@@ -28,7 +28,7 @@ class IotHubDescription extends models['Resource'] {
    * policies you can use to secure a connection to the IoT hub.
    * @member {array} [properties.ipFilterRules] The IP filter rules.
    * @member {string} [properties.provisioningState] The provisioning state.
-   * @member {string} [properties.state] The hub state.
+   * @member {string} [properties.state] Thehub state state.
    * @member {string} [properties.hostName] The name of the host.
    * @member {object} [properties.eventHubEndpoints] The Event Hub-compatible
    * endpoint properties. The possible keys to this dictionary are events and
@@ -106,6 +106,10 @@ class IotHubDescription extends models['Resource'] {
    * @member {string} [properties.comments] IoT hub comments.
    * @member {object} [properties.operationsMonitoringProperties]
    * @member {object} [properties.operationsMonitoringProperties.events]
+   * @member {object} [properties.deviceStreams] The device streams properties
+   * of iothub.
+   * @member {array} [properties.deviceStreams.streamingEndpoints] List of
+   * Device Streams Endpoints.
    * @member {string} [properties.features] The capabilities and features
    * enabled for the IoT hub. Possible values include: 'None',
    * 'DeviceManagement'
diff --git a/lib/services/iothub/lib/models/iotHubProperties.js b/lib/services/iothub/lib/models/iotHubProperties.js
index 78c140d79b..6936de1667 100644
--- a/lib/services/iothub/lib/models/iotHubProperties.js
+++ b/lib/services/iothub/lib/models/iotHubProperties.js
@@ -21,7 +21,7 @@ class IotHubProperties {
    * use to secure a connection to the IoT hub.
    * @member {array} [ipFilterRules] The IP filter rules.
    * @member {string} [provisioningState] The provisioning state.
-   * @member {string} [state] The hub state.
+   * @member {string} [state] Thehub state state.
    * @member {string} [hostName] The name of the host.
    * @member {object} [eventHubEndpoints] The Event Hub-compatible endpoint
    * properties. The possible keys to this dictionary are events and
@@ -95,6 +95,9 @@ class IotHubProperties {
    * @member {string} [comments] IoT hub comments.
    * @member {object} [operationsMonitoringProperties]
    * @member {object} [operationsMonitoringProperties.events]
+   * @member {object} [deviceStreams] The device streams properties of iothub.
+   * @member {array} [deviceStreams.streamingEndpoints] List of Device Streams
+   * Endpoints.
    * @member {string} [features] The capabilities and features enabled for the
    * IoT hub. Possible values include: 'None', 'DeviceManagement'
    */
@@ -252,6 +255,14 @@ class IotHubProperties {
               className: 'OperationsMonitoringProperties'
             }
           },
+          deviceStreams: {
+            required: false,
+            serializedName: 'deviceStreams',
+            type: {
+              name: 'Composite',
+              className: 'IotHubPropertiesDeviceStreams'
+            }
+          },
           features: {
             required: false,
             serializedName: 'features',
diff --git a/lib/services/iothub/lib/models/iotHubPropertiesDeviceStreams.js b/lib/services/iothub/lib/models/iotHubPropertiesDeviceStreams.js
new file mode 100644
index 0000000000..187290dccf
--- /dev/null
+++ b/lib/services/iothub/lib/models/iotHubPropertiesDeviceStreams.js
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License. See License.txt in the project root for
+ * license information.
+ *
+ * Code generated by Microsoft (R) AutoRest Code Generator.
+ * Changes may cause incorrect behavior and will be lost if the code is
+ * regenerated.
+ */
+
+'use strict';
+
+/**
+ * The device streams properties of iothub.
+ *
+ */
+class IotHubPropertiesDeviceStreams {
+  /**
+   * Create a IotHubPropertiesDeviceStreams.
+   * @member {array} [streamingEndpoints] List of Device Streams Endpoints.
+   */
+  constructor() {
+  }
+
+  /**
+   * Defines the metadata of IotHubPropertiesDeviceStreams
+   *
+   * @returns {object} metadata of IotHubPropertiesDeviceStreams
+   *
+   */
+  mapper() {
+    return {
+      required: false,
+      serializedName: 'IotHubProperties_deviceStreams',
+      type: {
+        name: 'Composite',
+        className: 'IotHubPropertiesDeviceStreams',
+        modelProperties: {
+          streamingEndpoints: {
+            required: false,
+            serializedName: 'streamingEndpoints',
+            type: {
+              name: 'Sequence',
+              element: {
+                  required: false,
+                  serializedName: 'StringElementType',
+                  type: {
+                    name: 'String'
+                  }
+              }
+            }
+          }
+        }
+      }
+    };
+  }
+}
+
+module.exports = IotHubPropertiesDeviceStreams;
diff --git a/lib/services/iothub/lib/models/operation.js b/lib/services/iothub/lib/models/operation.js
index cc8c17ff2b..83ad56c6f0 100644
--- a/lib/services/iothub/lib/models/operation.js
+++ b/lib/services/iothub/lib/models/operation.js
@@ -23,6 +23,7 @@ class Operation {
    * @member {string} [display.provider] Service provider: Microsoft Devices
    * @member {string} [display.resource] Resource Type: IotHubs
    * @member {string} [display.operation] Name of the operation
+   * @member {string} [display.description] Description of the operation
    */
   constructor() {
   }
diff --git a/lib/services/iothub/lib/models/operationDisplay.js b/lib/services/iothub/lib/models/operationDisplay.js
index 378fc9907a..6ed8f53b5f 100644
--- a/lib/services/iothub/lib/models/operationDisplay.js
+++ b/lib/services/iothub/lib/models/operationDisplay.js
@@ -20,6 +20,7 @@ class OperationDisplay {
    * @member {string} [provider] Service provider: Microsoft Devices
    * @member {string} [resource] Resource Type: IotHubs
    * @member {string} [operation] Name of the operation
+   * @member {string} [description] Description of the operation
    */
   constructor() {
   }
@@ -61,6 +62,14 @@ class OperationDisplay {
             type: {
               name: 'String'
             }
+          },
+          description: {
+            required: false,
+            readOnly: true,
+            serializedName: 'description',
+            type: {
+              name: 'String'
+            }
           }
         }
       }
diff --git a/lib/services/iothub/lib/models/routingStorageContainerProperties.js b/lib/services/iothub/lib/models/routingStorageContainerProperties.js
index b977fcb8ec..cb12edf6ee 100644
--- a/lib/services/iothub/lib/models/routingStorageContainerProperties.js
+++ b/lib/services/iothub/lib/models/routingStorageContainerProperties.js
@@ -40,7 +40,7 @@ class RoutingStorageContainerProperties {
    * blob written to storage. Value should be between 10485760(10MB) and
    * 524288000(500MB). Default value is 314572800(300MB).
    * @member {string} [encoding] Encoding that is used to serialize messages to
-   * blobs. Supported values are 'avro' and 'avroDeflate'. Default value is
+   * blobs. Supported values are 'avro' and 'avrodeflate'. Default value is
    * 'avro'.
    */
   constructor() {
diff --git a/lib/services/iothub/lib/models/routingTwin.js b/lib/services/iothub/lib/models/routingTwin.js
index 2af307f503..4cbf6039ec 100644
--- a/lib/services/iothub/lib/models/routingTwin.js
+++ b/lib/services/iothub/lib/models/routingTwin.js
@@ -19,8 +19,8 @@ class RoutingTwin {
    * Create a RoutingTwin.
    * @member {object} [tags] Twin Tags
    * @member {object} [properties]
-   * @member {object} [properties.desiredProperties] Twin desired properties
-   * @member {object} [properties.reportedProperties] Twin desired properties
+   * @member {object} [properties.desired] Twin desired properties
+   * @member {object} [properties.reported] Twin desired properties
    */
   constructor() {
   }
diff --git a/lib/services/iothub/lib/models/routingTwinProperties.js b/lib/services/iothub/lib/models/routingTwinProperties.js
index 07927c0a14..2ee55d39f4 100644
--- a/lib/services/iothub/lib/models/routingTwinProperties.js
+++ b/lib/services/iothub/lib/models/routingTwinProperties.js
@@ -16,8 +16,8 @@
 class RoutingTwinProperties {
   /**
    * Create a RoutingTwinProperties.
-   * @member {object} [desiredProperties] Twin desired properties
-   * @member {object} [reportedProperties] Twin desired properties
+   * @member {object} [desired] Twin desired properties
+   * @member {object} [reported] Twin desired properties
    */
   constructor() {
   }
@@ -36,16 +36,16 @@ class RoutingTwinProperties {
         name: 'Composite',
         className: 'RoutingTwinProperties',
         modelProperties: {
-          desiredProperties: {
+          desired: {
             required: false,
-            serializedName: 'desiredProperties',
+            serializedName: 'desired',
             type: {
               name: 'Object'
             }
           },
-          reportedProperties: {
+          reported: {
             required: false,
-            serializedName: 'reportedProperties',
+            serializedName: 'reported',
             type: {
               name: 'Object'
             }
diff --git a/lib/services/iothub/lib/models/storageEndpointProperties.js b/lib/services/iothub/lib/models/storageEndpointProperties.js
index 30b016a8b3..dfdd9b08ec 100644
--- a/lib/services/iothub/lib/models/storageEndpointProperties.js
+++ b/lib/services/iothub/lib/models/storageEndpointProperties.js
@@ -18,7 +18,7 @@ class StorageEndpointProperties {
   /**
    * Create a StorageEndpointProperties.
    * @member {moment.duration} [sasTtlAsIso8601] The period of time for which
-   * the SAS URI generated by IoT Hub for file upload is valid. See:
+   * the the SAS URI generated by IoT Hub for file upload is valid. See:
    * https://docs.microsoft.com/azure/iot-hub/iot-hub-devguide-file-upload#file-upload-notification-configuration-options.
    * @member {string} connectionString The connection string for the Azure
    * Storage account to which files are uploaded.
diff --git a/lib/services/iothub/lib/models/testAllRoutesInput.js b/lib/services/iothub/lib/models/testAllRoutesInput.js
index 3b698304cc..28aed44915 100644
--- a/lib/services/iothub/lib/models/testAllRoutesInput.js
+++ b/lib/services/iothub/lib/models/testAllRoutesInput.js
@@ -27,10 +27,8 @@ class TestAllRoutesInput {
    * @member {object} [twin] Routing Twin Reference
    * @member {object} [twin.tags] Twin Tags
    * @member {object} [twin.properties]
-   * @member {object} [twin.properties.desiredProperties] Twin desired
-   * properties
-   * @member {object} [twin.properties.reportedProperties] Twin desired
-   * properties
+   * @member {object} [twin.properties.desired] Twin desired properties
+   * @member {object} [twin.properties.reported] Twin desired properties
    */
   constructor() {
   }
diff --git a/lib/services/iothub/lib/models/testRouteInput.js b/lib/services/iothub/lib/models/testRouteInput.js
index 5d06df55a8..0f2fc9da9f 100644
--- a/lib/services/iothub/lib/models/testRouteInput.js
+++ b/lib/services/iothub/lib/models/testRouteInput.js
@@ -41,10 +41,8 @@ class TestRouteInput {
    * @member {object} [twin] Routing Twin Reference
    * @member {object} [twin.tags] Twin Tags
    * @member {object} [twin.properties]
-   * @member {object} [twin.properties.desiredProperties] Twin desired
-   * properties
-   * @member {object} [twin.properties.reportedProperties] Twin desired
-   * properties
+   * @member {object} [twin.properties.desired] Twin desired properties
+   * @member {object} [twin.properties.reported] Twin desired properties
    */
   constructor() {
   }
diff --git a/lib/services/iothub/lib/operations/index.d.ts b/lib/services/iothub/lib/operations/index.d.ts
index c7a85ba780..3ad5ac6ff5 100644
--- a/lib/services/iothub/lib/operations/index.d.ts
+++ b/lib/services/iothub/lib/operations/index.d.ts
@@ -345,6 +345,13 @@ export interface IotHubResource {
      * @param {object}
      * [iotHubDescription.properties.operationsMonitoringProperties.events]
      *
+     * @param {object} [iotHubDescription.properties.deviceStreams] The device
+     * streams properties of iothub.
+     *
+     * @param {array}
+     * [iotHubDescription.properties.deviceStreams.streamingEndpoints] List of
+     * Device Streams Endpoints.
+     *
      * @param {string} [iotHubDescription.properties.features] The capabilities and
      * features enabled for the IoT hub. Possible values include: 'None',
      * 'DeviceManagement'
@@ -520,6 +527,13 @@ export interface IotHubResource {
      * @param {object}
      * [iotHubDescription.properties.operationsMonitoringProperties.events]
      *
+     * @param {object} [iotHubDescription.properties.deviceStreams] The device
+     * streams properties of iothub.
+     *
+     * @param {array}
+     * [iotHubDescription.properties.deviceStreams.streamingEndpoints] List of
+     * Device Streams Endpoints.
+     *
      * @param {string} [iotHubDescription.properties.features] The capabilities and
      * features enabled for the IoT hub. Possible values include: 'None',
      * 'DeviceManagement'
@@ -1625,11 +1639,9 @@ export interface IotHubResource {
      *
      * @param {object} [input.twin.properties]
      *
-     * @param {object} [input.twin.properties.desiredProperties] Twin desired
-     * properties
+     * @param {object} [input.twin.properties.desired] Twin desired properties
      *
-     * @param {object} [input.twin.properties.reportedProperties] Twin desired
-     * properties
+     * @param {object} [input.twin.properties.reported] Twin desired properties
      *
      * @param {string} iotHubName IotHub to be tested
      *
@@ -1673,11 +1685,9 @@ export interface IotHubResource {
      *
      * @param {object} [input.twin.properties]
      *
-     * @param {object} [input.twin.properties.desiredProperties] Twin desired
-     * properties
+     * @param {object} [input.twin.properties.desired] Twin desired properties
      *
-     * @param {object} [input.twin.properties.reportedProperties] Twin desired
-     * properties
+     * @param {object} [input.twin.properties.reported] Twin desired properties
      *
      * @param {string} iotHubName IotHub to be tested
      *
@@ -1759,11 +1769,9 @@ export interface IotHubResource {
      *
      * @param {object} [input.twin.properties]
      *
-     * @param {object} [input.twin.properties.desiredProperties] Twin desired
-     * properties
+     * @param {object} [input.twin.properties.desired] Twin desired properties
      *
-     * @param {object} [input.twin.properties.reportedProperties] Twin desired
-     * properties
+     * @param {object} [input.twin.properties.reported] Twin desired properties
      *
      * @param {string} iotHubName IotHub to be tested
      *
@@ -1826,11 +1834,9 @@ export interface IotHubResource {
      *
      * @param {object} [input.twin.properties]
      *
-     * @param {object} [input.twin.properties.desiredProperties] Twin desired
-     * properties
+     * @param {object} [input.twin.properties.desired] Twin desired properties
      *
-     * @param {object} [input.twin.properties.reportedProperties] Twin desired
-     * properties
+     * @param {object} [input.twin.properties.reported] Twin desired properties
      *
      * @param {string} iotHubName IotHub to be tested
      *
@@ -2339,6 +2345,13 @@ export interface IotHubResource {
      * @param {object}
      * [iotHubDescription.properties.operationsMonitoringProperties.events]
      *
+     * @param {object} [iotHubDescription.properties.deviceStreams] The device
+     * streams properties of iothub.
+     *
+     * @param {array}
+     * [iotHubDescription.properties.deviceStreams.streamingEndpoints] List of
+     * Device Streams Endpoints.
+     *
      * @param {string} [iotHubDescription.properties.features] The capabilities and
      * features enabled for the IoT hub. Possible values include: 'None',
      * 'DeviceManagement'
@@ -2514,6 +2527,13 @@ export interface IotHubResource {
      * @param {object}
      * [iotHubDescription.properties.operationsMonitoringProperties.events]
      *
+     * @param {object} [iotHubDescription.properties.deviceStreams] The device
+     * streams properties of iothub.
+     *
+     * @param {array}
+     * [iotHubDescription.properties.deviceStreams.streamingEndpoints] List of
+     * Device Streams Endpoints.
+     *
      * @param {string} [iotHubDescription.properties.features] The capabilities and
      * features enabled for the IoT hub. Possible values include: 'None',
      * 'DeviceManagement'
diff --git a/lib/services/iothub/lib/operations/iotHubResource.js b/lib/services/iothub/lib/operations/iotHubResource.js
index d1d76ec7c2..bc04de92cc 100644
--- a/lib/services/iothub/lib/operations/iotHubResource.js
+++ b/lib/services/iothub/lib/operations/iotHubResource.js
@@ -306,6 +306,13 @@ function _get(resourceGroupName, resourceName, options, callback) {
  * @param {object}
  * [iotHubDescription.properties.operationsMonitoringProperties.events]
  *
+ * @param {object} [iotHubDescription.properties.deviceStreams] The device
+ * streams properties of iothub.
+ *
+ * @param {array}
+ * [iotHubDescription.properties.deviceStreams.streamingEndpoints] List of
+ * Device Streams Endpoints.
+ *
  * @param {string} [iotHubDescription.properties.features] The capabilities and
  * features enabled for the IoT hub. Possible values include: 'None',
  * 'DeviceManagement'
@@ -2573,11 +2580,9 @@ function _checkNameAvailability(name, options, callback) {
  *
  * @param {object} [input.twin.properties]
  *
- * @param {object} [input.twin.properties.desiredProperties] Twin desired
- * properties
+ * @param {object} [input.twin.properties.desired] Twin desired properties
  *
- * @param {object} [input.twin.properties.reportedProperties] Twin desired
- * properties
+ * @param {object} [input.twin.properties.reported] Twin desired properties
  *
  * @param {string} iotHubName IotHub to be tested
  *
@@ -2783,11 +2788,9 @@ function _testAllRoutes(input, iotHubName, resourceGroupName, options, callback)
  *
  * @param {object} [input.twin.properties]
  *
- * @param {object} [input.twin.properties.desiredProperties] Twin desired
- * properties
+ * @param {object} [input.twin.properties.desired] Twin desired properties
  *
- * @param {object} [input.twin.properties.reportedProperties] Twin desired
- * properties
+ * @param {object} [input.twin.properties.reported] Twin desired properties
  *
  * @param {string} iotHubName IotHub to be tested
  *
@@ -3761,6 +3764,13 @@ function _importDevices(resourceGroupName, resourceName, importDevicesParameters
  * @param {object}
  * [iotHubDescription.properties.operationsMonitoringProperties.events]
  *
+ * @param {object} [iotHubDescription.properties.deviceStreams] The device
+ * streams properties of iothub.
+ *
+ * @param {array}
+ * [iotHubDescription.properties.deviceStreams.streamingEndpoints] List of
+ * Device Streams Endpoints.
+ *
  * @param {string} [iotHubDescription.properties.features] The capabilities and
  * features enabled for the IoT hub. Possible values include: 'None',
  * 'DeviceManagement'
@@ -5657,6 +5667,13 @@ class IotHubResource {
    * @param {object}
    * [iotHubDescription.properties.operationsMonitoringProperties.events]
    *
+   * @param {object} [iotHubDescription.properties.deviceStreams] The device
+   * streams properties of iothub.
+   *
+   * @param {array}
+   * [iotHubDescription.properties.deviceStreams.streamingEndpoints] List of
+   * Device Streams Endpoints.
+   *
    * @param {string} [iotHubDescription.properties.features] The capabilities and
    * features enabled for the IoT hub. Possible values include: 'None',
    * 'DeviceManagement'
@@ -5844,6 +5861,13 @@ class IotHubResource {
    * @param {object}
    * [iotHubDescription.properties.operationsMonitoringProperties.events]
    *
+   * @param {object} [iotHubDescription.properties.deviceStreams] The device
+   * streams properties of iothub.
+   *
+   * @param {array}
+   * [iotHubDescription.properties.deviceStreams.streamingEndpoints] List of
+   * Device Streams Endpoints.
+   *
    * @param {string} [iotHubDescription.properties.features] The capabilities and
    * features enabled for the IoT hub. Possible values include: 'None',
    * 'DeviceManagement'
@@ -7369,11 +7393,9 @@ class IotHubResource {
    *
    * @param {object} [input.twin.properties]
    *
-   * @param {object} [input.twin.properties.desiredProperties] Twin desired
-   * properties
+   * @param {object} [input.twin.properties.desired] Twin desired properties
    *
-   * @param {object} [input.twin.properties.reportedProperties] Twin desired
-   * properties
+   * @param {object} [input.twin.properties.reported] Twin desired properties
    *
    * @param {string} iotHubName IotHub to be tested
    *
@@ -7429,11 +7451,9 @@ class IotHubResource {
    *
    * @param {object} [input.twin.properties]
    *
-   * @param {object} [input.twin.properties.desiredProperties] Twin desired
-   * properties
+   * @param {object} [input.twin.properties.desired] Twin desired properties
    *
-   * @param {object} [input.twin.properties.reportedProperties] Twin desired
-   * properties
+   * @param {object} [input.twin.properties.reported] Twin desired properties
    *
    * @param {string} iotHubName IotHub to be tested
    *
@@ -7530,11 +7550,9 @@ class IotHubResource {
    *
    * @param {object} [input.twin.properties]
    *
-   * @param {object} [input.twin.properties.desiredProperties] Twin desired
-   * properties
+   * @param {object} [input.twin.properties.desired] Twin desired properties
    *
-   * @param {object} [input.twin.properties.reportedProperties] Twin desired
-   * properties
+   * @param {object} [input.twin.properties.reported] Twin desired properties
    *
    * @param {string} iotHubName IotHub to be tested
    *
@@ -7609,11 +7627,9 @@ class IotHubResource {
    *
    * @param {object} [input.twin.properties]
    *
-   * @param {object} [input.twin.properties.desiredProperties] Twin desired
-   * properties
+   * @param {object} [input.twin.properties.desired] Twin desired properties
    *
-   * @param {object} [input.twin.properties.reportedProperties] Twin desired
-   * properties
+   * @param {object} [input.twin.properties.reported] Twin desired properties
    *
    * @param {string} iotHubName IotHub to be tested
    *
@@ -8245,6 +8261,13 @@ class IotHubResource {
    * @param {object}
    * [iotHubDescription.properties.operationsMonitoringProperties.events]
    *
+   * @param {object} [iotHubDescription.properties.deviceStreams] The device
+   * streams properties of iothub.
+   *
+   * @param {array}
+   * [iotHubDescription.properties.deviceStreams.streamingEndpoints] List of
+   * Device Streams Endpoints.
+   *
    * @param {string} [iotHubDescription.properties.features] The capabilities and
    * features enabled for the IoT hub. Possible values include: 'None',
    * 'DeviceManagement'
@@ -8432,6 +8455,13 @@ class IotHubResource {
    * @param {object}
    * [iotHubDescription.properties.operationsMonitoringProperties.events]
    *
+   * @param {object} [iotHubDescription.properties.deviceStreams] The device
+   * streams properties of iothub.
+   *
+   * @param {array}
+   * [iotHubDescription.properties.deviceStreams.streamingEndpoints] List of
+   * Device Streams Endpoints.
+   *
    * @param {string} [iotHubDescription.properties.features] The capabilities and
    * features enabled for the IoT hub. Possible values include: 'None',
    * 'DeviceManagement'