diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/iot_hub_client.py b/azure-mgmt-iothub/azure/mgmt/iothub/iot_hub_client.py
index 5875b7ed560f..b3a391f6075b 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/iot_hub_client.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/iot_hub_client.py
@@ -82,7 +82,7 @@ def __init__(
         super(IotHubClient, self).__init__(self.config.credentials, self.config)
 
         client_models = {k: v for k, v in models.__dict__.items() if isinstance(v, type)}
-        self.api_version = '2018-04-01'
+        self.api_version = '2018-12-01-preview'
         self._serialize = Serializer(client_models)
         self._deserialize = Deserializer(client_models)
 
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/__init__.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/__init__.py
index a770971ce06b..a469ce916b66 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/models/__init__.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/__init__.py
@@ -33,6 +33,7 @@
     from .feedback_properties_py3 import FeedbackProperties
     from .cloud_to_device_properties_py3 import CloudToDeviceProperties
     from .operations_monitoring_properties_py3 import OperationsMonitoringProperties
+    from .iot_hub_properties_device_streams_py3 import IotHubPropertiesDeviceStreams
     from .iot_hub_properties_py3 import IotHubProperties
     from .iot_hub_sku_info_py3 import IotHubSkuInfo
     from .iot_hub_description_py3 import IotHubDescription
@@ -91,6 +92,7 @@
     from .feedback_properties import FeedbackProperties
     from .cloud_to_device_properties import CloudToDeviceProperties
     from .operations_monitoring_properties import OperationsMonitoringProperties
+    from .iot_hub_properties_device_streams import IotHubPropertiesDeviceStreams
     from .iot_hub_properties import IotHubProperties
     from .iot_hub_sku_info import IotHubSkuInfo
     from .iot_hub_description import IotHubDescription
@@ -174,6 +176,7 @@
     'FeedbackProperties',
     'CloudToDeviceProperties',
     'OperationsMonitoringProperties',
+    'IotHubPropertiesDeviceStreams',
     'IotHubProperties',
     'IotHubSkuInfo',
     'IotHubDescription',
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties.py
index 1892e7d14d09..1433617a630c 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties.py
@@ -26,7 +26,7 @@ class IotHubProperties(Model):
     :type ip_filter_rules: list[~azure.mgmt.iothub.models.IpFilterRule]
     :ivar provisioning_state: The provisioning state.
     :vartype provisioning_state: str
-    :ivar state: The hub state.
+    :ivar state: Thehub state state.
     :vartype state: str
     :ivar host_name: The name of the host.
     :vartype host_name: str
@@ -60,6 +60,9 @@ class IotHubProperties(Model):
     :param operations_monitoring_properties:
     :type operations_monitoring_properties:
      ~azure.mgmt.iothub.models.OperationsMonitoringProperties
+    :param device_streams: The device streams properties of iothub.
+    :type device_streams:
+     ~azure.mgmt.iothub.models.IotHubPropertiesDeviceStreams
     :param features: The capabilities and features enabled for the IoT hub.
      Possible values include: 'None', 'DeviceManagement'
     :type features: str or ~azure.mgmt.iothub.models.Capabilities
@@ -85,6 +88,7 @@ class IotHubProperties(Model):
         'cloud_to_device': {'key': 'cloudToDevice', 'type': 'CloudToDeviceProperties'},
         'comments': {'key': 'comments', 'type': 'str'},
         'operations_monitoring_properties': {'key': 'operationsMonitoringProperties', 'type': 'OperationsMonitoringProperties'},
+        'device_streams': {'key': 'deviceStreams', 'type': 'IotHubPropertiesDeviceStreams'},
         'features': {'key': 'features', 'type': 'str'},
     }
 
@@ -103,4 +107,5 @@ def __init__(self, **kwargs):
         self.cloud_to_device = kwargs.get('cloud_to_device', None)
         self.comments = kwargs.get('comments', None)
         self.operations_monitoring_properties = kwargs.get('operations_monitoring_properties', None)
+        self.device_streams = kwargs.get('device_streams', None)
         self.features = kwargs.get('features', None)
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties_device_streams.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties_device_streams.py
new file mode 100644
index 000000000000..985693ac090f
--- /dev/null
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties_device_streams.py
@@ -0,0 +1,28 @@
+# coding=utf-8
+# --------------------------------------------------------------------------
+# 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.
+# --------------------------------------------------------------------------
+
+from msrest.serialization import Model
+
+
+class IotHubPropertiesDeviceStreams(Model):
+    """The device streams properties of iothub.
+
+    :param streaming_endpoints: List of Device Streams Endpoints.
+    :type streaming_endpoints: list[str]
+    """
+
+    _attribute_map = {
+        'streaming_endpoints': {'key': 'streamingEndpoints', 'type': '[str]'},
+    }
+
+    def __init__(self, **kwargs):
+        super(IotHubPropertiesDeviceStreams, self).__init__(**kwargs)
+        self.streaming_endpoints = kwargs.get('streaming_endpoints', None)
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties_device_streams_py3.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties_device_streams_py3.py
new file mode 100644
index 000000000000..d35247cc448c
--- /dev/null
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties_device_streams_py3.py
@@ -0,0 +1,28 @@
+# coding=utf-8
+# --------------------------------------------------------------------------
+# 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.
+# --------------------------------------------------------------------------
+
+from msrest.serialization import Model
+
+
+class IotHubPropertiesDeviceStreams(Model):
+    """The device streams properties of iothub.
+
+    :param streaming_endpoints: List of Device Streams Endpoints.
+    :type streaming_endpoints: list[str]
+    """
+
+    _attribute_map = {
+        'streaming_endpoints': {'key': 'streamingEndpoints', 'type': '[str]'},
+    }
+
+    def __init__(self, *, streaming_endpoints=None, **kwargs) -> None:
+        super(IotHubPropertiesDeviceStreams, self).__init__(**kwargs)
+        self.streaming_endpoints = streaming_endpoints
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties_py3.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties_py3.py
index 25a848002caf..746000fd6a34 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties_py3.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/iot_hub_properties_py3.py
@@ -26,7 +26,7 @@ class IotHubProperties(Model):
     :type ip_filter_rules: list[~azure.mgmt.iothub.models.IpFilterRule]
     :ivar provisioning_state: The provisioning state.
     :vartype provisioning_state: str
-    :ivar state: The hub state.
+    :ivar state: Thehub state state.
     :vartype state: str
     :ivar host_name: The name of the host.
     :vartype host_name: str
@@ -60,6 +60,9 @@ class IotHubProperties(Model):
     :param operations_monitoring_properties:
     :type operations_monitoring_properties:
      ~azure.mgmt.iothub.models.OperationsMonitoringProperties
+    :param device_streams: The device streams properties of iothub.
+    :type device_streams:
+     ~azure.mgmt.iothub.models.IotHubPropertiesDeviceStreams
     :param features: The capabilities and features enabled for the IoT hub.
      Possible values include: 'None', 'DeviceManagement'
     :type features: str or ~azure.mgmt.iothub.models.Capabilities
@@ -85,10 +88,11 @@ class IotHubProperties(Model):
         'cloud_to_device': {'key': 'cloudToDevice', 'type': 'CloudToDeviceProperties'},
         'comments': {'key': 'comments', 'type': 'str'},
         'operations_monitoring_properties': {'key': 'operationsMonitoringProperties', 'type': 'OperationsMonitoringProperties'},
+        'device_streams': {'key': 'deviceStreams', 'type': 'IotHubPropertiesDeviceStreams'},
         'features': {'key': 'features', 'type': 'str'},
     }
 
-    def __init__(self, *, authorization_policies=None, ip_filter_rules=None, event_hub_endpoints=None, routing=None, storage_endpoints=None, messaging_endpoints=None, enable_file_upload_notifications: bool=None, cloud_to_device=None, comments: str=None, operations_monitoring_properties=None, features=None, **kwargs) -> None:
+    def __init__(self, *, authorization_policies=None, ip_filter_rules=None, event_hub_endpoints=None, routing=None, storage_endpoints=None, messaging_endpoints=None, enable_file_upload_notifications: bool=None, cloud_to_device=None, comments: str=None, operations_monitoring_properties=None, device_streams=None, features=None, **kwargs) -> None:
         super(IotHubProperties, self).__init__(**kwargs)
         self.authorization_policies = authorization_policies
         self.ip_filter_rules = ip_filter_rules
@@ -103,4 +107,5 @@ def __init__(self, *, authorization_policies=None, ip_filter_rules=None, event_h
         self.cloud_to_device = cloud_to_device
         self.comments = comments
         self.operations_monitoring_properties = operations_monitoring_properties
+        self.device_streams = device_streams
         self.features = features
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/operation_display.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/operation_display.py
index 3f5abb359ff7..1be587a52f9d 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/models/operation_display.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/operation_display.py
@@ -24,18 +24,22 @@ class OperationDisplay(Model):
     :vartype resource: str
     :ivar operation: Name of the operation
     :vartype operation: str
+    :ivar description: Description of the operation
+    :vartype description: str
     """
 
     _validation = {
         'provider': {'readonly': True},
         'resource': {'readonly': True},
         'operation': {'readonly': True},
+        'description': {'readonly': True},
     }
 
     _attribute_map = {
         'provider': {'key': 'provider', 'type': 'str'},
         'resource': {'key': 'resource', 'type': 'str'},
         'operation': {'key': 'operation', 'type': 'str'},
+        'description': {'key': 'description', 'type': 'str'},
     }
 
     def __init__(self, **kwargs):
@@ -43,3 +47,4 @@ def __init__(self, **kwargs):
         self.provider = None
         self.resource = None
         self.operation = None
+        self.description = None
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/operation_display_py3.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/operation_display_py3.py
index fdf5a7812423..6d30aa033547 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/models/operation_display_py3.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/operation_display_py3.py
@@ -24,18 +24,22 @@ class OperationDisplay(Model):
     :vartype resource: str
     :ivar operation: Name of the operation
     :vartype operation: str
+    :ivar description: Description of the operation
+    :vartype description: str
     """
 
     _validation = {
         'provider': {'readonly': True},
         'resource': {'readonly': True},
         'operation': {'readonly': True},
+        'description': {'readonly': True},
     }
 
     _attribute_map = {
         'provider': {'key': 'provider', 'type': 'str'},
         'resource': {'key': 'resource', 'type': 'str'},
         'operation': {'key': 'operation', 'type': 'str'},
+        'description': {'key': 'description', 'type': 'str'},
     }
 
     def __init__(self, **kwargs) -> None:
@@ -43,3 +47,4 @@ def __init__(self, **kwargs) -> None:
         self.provider = None
         self.resource = None
         self.operation = None
+        self.description = None
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_storage_container_properties.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_storage_container_properties.py
index de849fc2b91f..b8a5e9cbede9 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_storage_container_properties.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_storage_container_properties.py
@@ -48,7 +48,7 @@ class RoutingStorageContainerProperties(Model):
      524288000(500MB). Default value is 314572800(300MB).
     :type max_chunk_size_in_bytes: int
     :param encoding: Encoding that is used to serialize messages to blobs.
-     Supported values are 'avro' and 'avroDeflate'. Default value is 'avro'.
+     Supported values are 'avro' and 'avrodeflate'. Default value is 'avro'.
     :type encoding: str
     """
 
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_storage_container_properties_py3.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_storage_container_properties_py3.py
index 810785ffb222..50b99f1fb73b 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_storage_container_properties_py3.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_storage_container_properties_py3.py
@@ -48,7 +48,7 @@ class RoutingStorageContainerProperties(Model):
      524288000(500MB). Default value is 314572800(300MB).
     :type max_chunk_size_in_bytes: int
     :param encoding: Encoding that is used to serialize messages to blobs.
-     Supported values are 'avro' and 'avroDeflate'. Default value is 'avro'.
+     Supported values are 'avro' and 'avrodeflate'. Default value is 'avro'.
     :type encoding: str
     """
 
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_twin_properties.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_twin_properties.py
index 5a2a524b2856..dca08414ddf2 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_twin_properties.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_twin_properties.py
@@ -15,18 +15,18 @@
 class RoutingTwinProperties(Model):
     """RoutingTwinProperties.
 
-    :param desired_properties: Twin desired properties
-    :type desired_properties: object
-    :param reported_properties: Twin desired properties
-    :type reported_properties: object
+    :param desired: Twin desired properties
+    :type desired: object
+    :param reported: Twin desired properties
+    :type reported: object
     """
 
     _attribute_map = {
-        'desired_properties': {'key': 'desiredProperties', 'type': 'object'},
-        'reported_properties': {'key': 'reportedProperties', 'type': 'object'},
+        'desired': {'key': 'desired', 'type': 'object'},
+        'reported': {'key': 'reported', 'type': 'object'},
     }
 
     def __init__(self, **kwargs):
         super(RoutingTwinProperties, self).__init__(**kwargs)
-        self.desired_properties = kwargs.get('desired_properties', None)
-        self.reported_properties = kwargs.get('reported_properties', None)
+        self.desired = kwargs.get('desired', None)
+        self.reported = kwargs.get('reported', None)
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_twin_properties_py3.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_twin_properties_py3.py
index 4d6b8bfcf34c..9e77dccafaeb 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_twin_properties_py3.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/routing_twin_properties_py3.py
@@ -15,18 +15,18 @@
 class RoutingTwinProperties(Model):
     """RoutingTwinProperties.
 
-    :param desired_properties: Twin desired properties
-    :type desired_properties: object
-    :param reported_properties: Twin desired properties
-    :type reported_properties: object
+    :param desired: Twin desired properties
+    :type desired: object
+    :param reported: Twin desired properties
+    :type reported: object
     """
 
     _attribute_map = {
-        'desired_properties': {'key': 'desiredProperties', 'type': 'object'},
-        'reported_properties': {'key': 'reportedProperties', 'type': 'object'},
+        'desired': {'key': 'desired', 'type': 'object'},
+        'reported': {'key': 'reported', 'type': 'object'},
     }
 
-    def __init__(self, *, desired_properties=None, reported_properties=None, **kwargs) -> None:
+    def __init__(self, *, desired=None, reported=None, **kwargs) -> None:
         super(RoutingTwinProperties, self).__init__(**kwargs)
-        self.desired_properties = desired_properties
-        self.reported_properties = reported_properties
+        self.desired = desired
+        self.reported = reported
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/storage_endpoint_properties.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/storage_endpoint_properties.py
index c7d89dd13b2b..e9664199efa8 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/models/storage_endpoint_properties.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/storage_endpoint_properties.py
@@ -17,7 +17,7 @@ class StorageEndpointProperties(Model):
 
     All required parameters must be populated in order to send to Azure.
 
-    :param sas_ttl_as_iso8601: The period of time for which the SAS URI
+    :param sas_ttl_as_iso8601: The period of time for which 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.
     :type sas_ttl_as_iso8601: timedelta
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/models/storage_endpoint_properties_py3.py b/azure-mgmt-iothub/azure/mgmt/iothub/models/storage_endpoint_properties_py3.py
index 015e0488bd7b..54193d3eaab8 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/models/storage_endpoint_properties_py3.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/models/storage_endpoint_properties_py3.py
@@ -17,7 +17,7 @@ class StorageEndpointProperties(Model):
 
     All required parameters must be populated in order to send to Azure.
 
-    :param sas_ttl_as_iso8601: The period of time for which the SAS URI
+    :param sas_ttl_as_iso8601: The period of time for which 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.
     :type sas_ttl_as_iso8601: timedelta
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/operations/certificates_operations.py b/azure-mgmt-iothub/azure/mgmt/iothub/operations/certificates_operations.py
index 97425c41acd4..41084fd1b8d8 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/operations/certificates_operations.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/operations/certificates_operations.py
@@ -22,7 +22,7 @@ class CertificatesOperations(object):
     :param config: Configuration of service client.
     :param serializer: An object model serializer.
     :param deserializer: An object model deserializer.
-    :ivar api_version: The version of the API. Constant value: "2018-04-01".
+    :ivar api_version: The version of the API. Constant value: "2018-12-01-preview".
     """
 
     models = models
@@ -32,7 +32,7 @@ def __init__(self, client, config, serializer, deserializer):
         self._client = client
         self._serialize = serializer
         self._deserialize = deserializer
-        self.api_version = "2018-04-01"
+        self.api_version = "2018-12-01-preview"
 
         self.config = config
 
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/operations/iot_hub_resource_operations.py b/azure-mgmt-iothub/azure/mgmt/iothub/operations/iot_hub_resource_operations.py
index c2356f337f88..c6ce3ae93e02 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/operations/iot_hub_resource_operations.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/operations/iot_hub_resource_operations.py
@@ -25,7 +25,7 @@ class IotHubResourceOperations(object):
     :param config: Configuration of service client.
     :param serializer: An object model serializer.
     :param deserializer: An object model deserializer.
-    :ivar api_version: The version of the API. Constant value: "2018-04-01".
+    :ivar api_version: The version of the API. Constant value: "2018-12-01-preview".
     """
 
     models = models
@@ -35,7 +35,7 @@ def __init__(self, client, config, serializer, deserializer):
         self._client = client
         self._serialize = serializer
         self._deserialize = deserializer
-        self.api_version = "2018-04-01"
+        self.api_version = "2018-12-01-preview"
 
         self.config = config
 
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/operations/operations.py b/azure-mgmt-iothub/azure/mgmt/iothub/operations/operations.py
index d6bb6115948f..e7075cd47736 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/operations/operations.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/operations/operations.py
@@ -22,7 +22,7 @@ class Operations(object):
     :param config: Configuration of service client.
     :param serializer: An object model serializer.
     :param deserializer: An object model deserializer.
-    :ivar api_version: The version of the API. Constant value: "2018-04-01".
+    :ivar api_version: The version of the API. Constant value: "2018-12-01-preview".
     """
 
     models = models
@@ -32,7 +32,7 @@ def __init__(self, client, config, serializer, deserializer):
         self._client = client
         self._serialize = serializer
         self._deserialize = deserializer
-        self.api_version = "2018-04-01"
+        self.api_version = "2018-12-01-preview"
 
         self.config = config
 
diff --git a/azure-mgmt-iothub/azure/mgmt/iothub/operations/resource_provider_common_operations.py b/azure-mgmt-iothub/azure/mgmt/iothub/operations/resource_provider_common_operations.py
index 78d3bb5be0c8..2364faf8dc28 100644
--- a/azure-mgmt-iothub/azure/mgmt/iothub/operations/resource_provider_common_operations.py
+++ b/azure-mgmt-iothub/azure/mgmt/iothub/operations/resource_provider_common_operations.py
@@ -22,7 +22,7 @@ class ResourceProviderCommonOperations(object):
     :param config: Configuration of service client.
     :param serializer: An object model serializer.
     :param deserializer: An object model deserializer.
-    :ivar api_version: The version of the API. Constant value: "2018-04-01".
+    :ivar api_version: The version of the API. Constant value: "2018-12-01-preview".
     """
 
     models = models
@@ -32,7 +32,7 @@ def __init__(self, client, config, serializer, deserializer):
         self._client = client
         self._serialize = serializer
         self._deserialize = deserializer
-        self.api_version = "2018-04-01"
+        self.api_version = "2018-12-01-preview"
 
         self.config = config