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Twin Class

The state information for a device or module. This is implicitly created and deleted when the corresponding device/ module identity is created or deleted in the IoT Hub.

Constructor

Twin(*, device_id: str = None, module_id: str = None, tags=None, properties=None, etag: str = None, version: int = None, device_etag: str = None, status=None, status_reason: str = None, status_update_time=None, connection_state=None, last_activity_time=None, cloud_to_device_message_count: int = None, authentication_type=None, x509_thumbprint=None, capabilities=None, device_scope: str = None, parent_scopes=None, **kwargs)

Parameters

Name Description
device_id
Required
str

The unique identifier of the device in the identity registry of the IoT Hub. It is a case-sensitive string (up to 128 char long) of ASCII 7-bit alphanumeric chars, and the following special characters {'-', ':', '.', '+', '%', '_', '#', '*', '?', '!', '(', ')', ',', '=', '@', ';', '$', '''}.
module_id
Required
str

The unique identifier of the module in the identity registry of the IoT Hub. It is a case-sensitive string (up to 128 char long) of ASCII 7-bit alphanumeric chars, and the following special characters {'-', ':', '.', '+', '%', '_', '#', '*', '?', '!', '(', ')', ',', '=', '@', ';', '$', '''}.
tags
Required
dict[str, object]

The collection of key-value pairs read and written by the solution back end. They are not visible to device apps. They keys are UTF-8 encoded, case-sensitive and up-to 1KB in length. Allowed characters exclude UNICODE control characters (segments C0 and C1), '.', '$' and space. The values are JSON objects, up-to 4KB in length.
properties
Required
TwinProperties

The desired and reported properties of the twin.
etag
Required
str

The string representing a ETag for the device twin, as per RFC7232.
version
Required
<xref:long>

The version for the device twin including tags and desired properties
device_etag
Required
str

The string representing a ETag for the device, as per RFC7232.
status
Required
str or <xref:protocol.models.enum>

The enabled status of the device. If disabled, the device cannot connect to the service. Possible values include: 'enabled', 'disabled'
status_reason
Required
str

The reason for the current status of the device, if any.
status_update_time
Required
datetime

The date and time when the status of the device was last updated.
connection_state
Required
str or <xref:protocol.models.enum>

The connection state of the device. Possible values include: 'Disconnected', 'Connected'
last_activity_time
Required
datetime

The date and time when the device last connected or received or sent a message. The date and time is sepecified in ISO8601 datetime format in UTC, for example, 2015-01-28T16:24:48.789Z. This value is not updated if the device uses the HTTP/1 protocol to perform messaging operations.
cloud_to_device_message_count
Required
int

The number of cloud-to-device messages sent.
authentication_type
Required
str or <xref:protocol.models.enum>

The authentication type used by the device. Possible values include: 'sas', 'selfSigned', 'certificateAuthority', 'none'
x509_thumbprint
Required
X509Thumbprint

The X509 thumbprint of the device.
capabilities
Required
DeviceCapabilities
device_scope
Required
str

The scope of the device.
parent_scopes
Required
list[str]

The scopes of the upper level edge devices if applicable. Only available for edge devices.

Keyword-Only Parameters

Name Description
device_id
Default value: None
module_id
Default value: None
tags
Default value: None
properties
Default value: None
etag
Default value: None
version
Default value: None
device_etag
Default value: None
status
Default value: None
status_reason
Default value: None
status_update_time
Default value: None
connection_state
Default value: None
last_activity_time
Default value: None
cloud_to_device_message_count
Default value: None
authentication_type
Default value: None
x509_thumbprint
Default value: None
capabilities
Default value: None
device_scope
Default value: None
parent_scopes
Default value: None

Methods

as_dict

Return a dict that can be JSONify using json.dump.

Advanced usage might optionally use a callback as parameter:

Key is the attribute name used in Python. Attr_desc is a dict of metadata. Currently contains 'type' with the msrest type and 'key' with the RestAPI encoded key. Value is the current value in this object.

The string returned will be used to serialize the key. If the return type is a list, this is considered hierarchical result dict.

See the three examples in this file:

  • attribute_transformer

  • full_restapi_key_transformer

  • last_restapi_key_transformer

If you want XML serialization, you can pass the kwargs is_xml=True.
deserialize

Parse a str using the RestAPI syntax and return a model.
enable_additional_properties_sending
from_dict

Parse a dict using given key extractor return a model.

By default consider key extractors (rest_key_case_insensitive_extractor, attribute_key_case_insensitive_extractor and last_rest_key_case_insensitive_extractor)
is_xml_model
serialize

Return the JSON that would be sent to azure from this model.

This is an alias to as_dict(full_restapi_key_transformer, keep_readonly=False).

If you want XML serialization, you can pass the kwargs is_xml=True.
validate

Validate this model recursively and return a list of ValidationError.

as_dict

Return a dict that can be JSONify using json.dump.

Advanced usage might optionally use a callback as parameter:

Key is the attribute name used in Python. Attr_desc is a dict of metadata. Currently contains 'type' with the msrest type and 'key' with the RestAPI encoded key. Value is the current value in this object.

The string returned will be used to serialize the key. If the return type is a list, this is considered hierarchical result dict.

See the three examples in this file:

  • attribute_transformer

  • full_restapi_key_transformer

  • last_restapi_key_transformer

If you want XML serialization, you can pass the kwargs is_xml=True.

as_dict(keep_readonly=True, key_transformer=<function attribute_transformer>, **kwargs)

Parameters

Name Description
key_transformer
<xref:function>

A key transformer function.
keep_readonly
Default value: True

Returns

Type Description
dict

A dict JSON compatible object

deserialize

Parse a str using the RestAPI syntax and return a model.

deserialize(data, content_type=None)

Parameters

Name Description
data
Required
str

A str using RestAPI structure. JSON by default.
content_type
str

JSON by default, set application/xml if XML.

Default value: None

Returns

Type Description

An instance of this model

Exceptions

Type Description
DeserializationError if something went wrong

enable_additional_properties_sending 

enable_additional_properties_sending()

from_dict

Parse a dict using given key extractor return a model.

By default consider key extractors (rest_key_case_insensitive_extractor, attribute_key_case_insensitive_extractor and last_rest_key_case_insensitive_extractor)

from_dict(data, key_extractors=None, content_type=None)

Parameters

Name Description
data
Required
dict

A dict using RestAPI structure
content_type
str

JSON by default, set application/xml if XML.

Default value: None
key_extractors
Default value: None

Returns

Type Description

An instance of this model

Exceptions

Type Description
DeserializationError if something went wrong

is_xml_model 

is_xml_model()

serialize

Return the JSON that would be sent to azure from this model.

This is an alias to as_dict(full_restapi_key_transformer, keep_readonly=False).

If you want XML serialization, you can pass the kwargs is_xml=True.

serialize(keep_readonly=False, **kwargs)

Parameters

Name Description
keep_readonly
bool

If you want to serialize the readonly attributes

Default value: False

Returns

Type Description
dict

A dict JSON compatible object

validate

Validate this model recursively and return a list of ValidationError.

validate()

Returns

Type Description
list

A list of validation error