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* Use [file upload capabilities of IoT Hub](iot-hub-devguide-file-upload.md) to upload a file to [Azure Blob Storage](../storage/index.yml), using an Azure IoT device and service SDKs.
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* Notify IoT Hub that the file was successfully uploaded and create a backend service to receive file upload notifications from IoT Hub.
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* Use file upload capabilities of IoT Hub to upload a file to Azure Blob Storage, using an Azure IoT device and service SDKs.
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* Notify IoT Hub that the file was successfully uploaded and create a backend service to receive file upload notifications from IoT Hub, using the Azure IoT service SDKs.
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In some scenarios, you can't easily map the data your devices send into the relatively small device-to-cloud messages that IoT Hub accepts. The file upload capabilities in IoT Hub enable you to move large or complex data to the cloud. For example:
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For more information, see:
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*[Overview of file uploads with IoT Hub](iot-hub-devguide-file-upload.md)
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*[Configure IoT Hub file uploads using the Azure portal](iot-hub-configure-file-upload.md)
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*[Introduction to Azure Blob Storage](../storage/blobs/storage-blobs-introduction.md)
***An IoT hub**. Create one using the [Azure portal, CLI, or PowerShell](create-hub.md). Some SDK calls require the IoT Hub connection string, so make a note of the connection string.
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***An IoT hub**. Some SDK calls require the IoT Hub primary connection string, so make a note of the connection string.
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***A registered device**. Register one in the [Azure portal](create-connect-device.md).
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***A registered device**. Some SDK calls require the device primary connection string, so make a note of the connection string.
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* IoT Hub **Service Connect**permission - To receive file upload notification messages, your backend service needs the **Service Connect** permission. By default, every IoT Hub is created with a shared access policy named **service** that grants this permission. For more information, see [Connect to an IoT hub](/azure/iot-hub/create-hub?&tabs=portal#connect-to-an-iot-hub).
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* IoT Hub **Service Connect** permission - To receive file upload notification messages, your backend service needs the **Service Connect** permission. By default, every IoT Hub is created with a shared access policy named **service** that grants this permission. For more information, see [Connect to an IoT hub](/azure/iot-hub/create-hub?&tabs=portal#connect-to-an-iot-hub).
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* Configure file upload in your IoT hub by linking an **Azure Storage account** and **Azure Blob Storage container** associated with IoT Hub. You can configure these using the [Azure portal](/azure/iot-hub/iot-hub-configure-file-upload), [Azure CLI](/azure/iot-hub/iot-hub-configure-file-upload-cli), or [Azure PowerShell](/azure/iot-hub/iot-hub-configure-file-upload-powershell).
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* Configure file upload in your IoT hub by linking an **Azure Storage account** and **Azure Blob Storage container**. You can configure these using the [Azure portal](/azure/iot-hub/iot-hub-configure-file-upload), [Azure CLI](/azure/iot-hub/iot-hub-configure-file-upload-cli), or [Azure PowerShell](/azure/iot-hub/iot-hub-configure-file-upload-powershell).
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@@ -24,14 +24,14 @@ This section describes how to upload a file from a device to an IoT hub using th
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Follow this procedure to upload a file from a device to IoT hub:
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* Connect to IoT hub
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* Get a SAS URI from IoT hub
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* Upload the file to Azure storage
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* Notify IoT hub of the file upload status
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1. Connect to IoT hub
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1. Get a SAS URI from IoT hub
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1. Upload the file to Azure storage
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1. Notify IoT hub of the file upload status
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### Connect to the device
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Call [CreateFromConnectionString](/dotnet/api/microsoft.azure.devices.client.deviceclient.createfromconnectionstring?#microsoft-azure-devices-client-deviceclient-createfromconnectionstring(system-string)) to connect to the device. See the prerequisites section for how to look up the device primary connection string.
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Call [CreateFromConnectionString](/dotnet/api/microsoft.azure.devices.client.deviceclient.createfromconnectionstring?#microsoft-azure-devices-client-deviceclient-createfromconnectionstring(system-string)) to connect to the device. Pass the device primary connection string.
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`AMQP` is the default transport protocol.
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To upload a file to Azure storage:
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* Create a [blockBlobClient](/dotnet/api/azure.storage.blobs.specialized.blockblobclient) object, passing a file upload URI
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1. Create a [blockBlobClient](/dotnet/api/azure.storage.blobs.specialized.blockblobclient) object, passing a file upload URI
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* Use the [UploadAsync](/dotnet/api/azure.storage.blobs.specialized.blockblobclient.uploadasync?#azure-storage-blobs-specialized-blockblobclient-uploadasync(system-io-stream-azure-storage-blobs-models-blobuploadoptions-system-threading-cancellationtoken)) method to upload a file to Blob Storage, passing the SAS URI. You can optionally add Blob upload options and cancellation token parameters.
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1. Use the [UploadAsync](/dotnet/api/azure.storage.blobs.specialized.blockblobclient.uploadasync?#azure-storage-blobs-specialized-blockblobclient-uploadasync(system-io-stream-azure-storage-blobs-models-blobuploadoptions-system-threading-cancellationtoken)) method to upload a file to Blob Storage, passing the SAS URI. You can optionally add Blob upload options and cancellation token parameters.
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The Azure Blob client always uses HTTPS as the protocol to upload the file to Azure Storage.
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To receive file upload notification:
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* Call [CreateFromConnectionString](/dotnet/api/microsoft.azure.devices.serviceclient.createfromconnectionstring) to connect to IoT hub. Pass the IoT hub connection string. See the prerequisites section for how to look up the IoT hub primary connection string.
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* Create a [CancellationToken](/dotnet/api/azure.core.httpmessage.cancellationtoken?#azure-core-httpmessage-cancellationtoken).
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* Call [GetFileNotificationReceiver](/dotnet/api/microsoft.azure.devices.serviceclient.getfilenotificationreceiver?#microsoft-azure-devices-serviceclient-getfilenotificationreceiver) to create a notification receiver.
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* Use a loop with [ReceiveAsync](/dotnet/api/microsoft.azure.devices.receiver-1.receiveasync?#microsoft-azure-devices-receiver-1-receiveasync(system-threading-cancellationtoken)) to wait for the file upload notification.
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1. Call [CreateFromConnectionString](/dotnet/api/microsoft.azure.devices.serviceclient.createfromconnectionstring) to connect to IoT hub. Pass the IoT hub primary connection string.
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1. Create a [CancellationToken](/dotnet/api/azure.core.httpmessage.cancellationtoken?#azure-core-httpmessage-cancellationtoken).
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1. Call [GetFileNotificationReceiver](/dotnet/api/microsoft.azure.devices.serviceclient.getfilenotificationreceiver?#microsoft-azure-devices-serviceclient-getfilenotificationreceiver) to create a notification receiver.
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1. Use a loop with [ReceiveAsync](/dotnet/api/microsoft.azure.devices.receiver-1.receiveasync?#microsoft-azure-devices-receiver-1-receiveasync(system-threading-cancellationtoken)) to wait for the file upload notification.
Instantiate the `DeviceClient` to connect to the device using the device primary connection string. See the prerequisites section for how to look up the device primary connection string.
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Instantiate the `DeviceClient` to connect to the device using the device primary connection string.
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```java
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String connString ="{IoT hub connection string}";
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To create a file upload notification application:
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* Connect to the IoT hub service client
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* Check for a file upload notification
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1. Connect to the IoT hub service client
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1. Check for a file upload notification
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The [ServiceClient](/java/api/com.azure.core.annotation.serviceclient) class contains methods that services can use to receive file upload notifications.
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### Connect to the IoT hub service client
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Create a `IotHubServiceClientProtocol` object. The connection uses the `AMQPS` protocol.
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Call `createFromConnectionString` to connect to IoT hub. Pass the IoT hub primary connection string. See the prerequisites section for how to look up the IoT hub primary connection string.
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Call `createFromConnectionString` to connect to IoT hub. Pass the IoT hub primary connection string.
* Create a [getFileUploadNotificationReceiver](/java/api/com.microsoft.azure.sdk.iot.service.fileuploadnotificationreceiver) object
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* Use [open](/java/api/com.microsoft.azure.sdk.iot.service.fileuploadnotificationreceiver?#com-microsoft-azure-sdk-iot-service-fileuploadnotificationreceiver-open()) to connect to IoT hub
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* Call [receive](/java/api/com.microsoft.azure.sdk.iot.service.fileuploadnotificationreceiver?#com-microsoft-azure-sdk-iot-service-fileuploadnotificationreceiver-receive()) to check for the file upload status. This method returns a [fileUploadNotification](/java/api/com.microsoft.azure.sdk.iot.service.fileuploadnotification) object. If an upload notice is received, you can view upload status fields using [fileUploadNotification](/java/api/com.microsoft.azure.sdk.iot.service.fileuploadnotification) methods.
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1. Create a [getFileUploadNotificationReceiver](/java/api/com.microsoft.azure.sdk.iot.service.fileuploadnotificationreceiver) object
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1. Use [open](/java/api/com.microsoft.azure.sdk.iot.service.fileuploadnotificationreceiver?#com-microsoft-azure-sdk-iot-service-fileuploadnotificationreceiver-open()) to connect to IoT hub
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1. Call [receive](/java/api/com.microsoft.azure.sdk.iot.service.fileuploadnotificationreceiver?#com-microsoft-azure-sdk-iot-service-fileuploadnotificationreceiver-receive()) to check for the file upload status. This method returns a [fileUploadNotification](/java/api/com.microsoft.azure.sdk.iot.service.fileuploadnotification) object. If an upload notice is received, you can view upload status fields using [fileUploadNotification](/java/api/com.microsoft.azure.sdk.iot.service.fileuploadnotification) methods.
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Follow this procedure for uploading a file from a device to IoT hub:
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* Get Blob shared access signatures
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* Upload the file to Azure Storage
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* Send file upload status notification to IoT hub
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1. Get Blob shared access signatures
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1. Upload the file to Azure Storage
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1. Send file upload status notification to IoT hub
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### Create modules
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To create a file upload notification application:
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* Connect to the IoT hub service client
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* Check for a file upload notification
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1. Connect to the IoT hub service client
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1. Check for a file upload notification
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### Connect to the IoT hub service client
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The [ServiceClient](/javascript/api/azure-iothub/client) class contains methods that services can use to receive file upload notifications.
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Connect to IoT hub using [fromConnectionString](/javascript/api/azure-iothub/client?#azure-iothub-client-fromconnectionstring). See the prerequisites section for how to look up the IoT hub primary connection string.
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Connect to IoT hub using [fromConnectionString](/javascript/api/azure-iothub/client?#azure-iothub-client-fromconnectionstring). Pass the IoT hub primary connection string.
* Call [getFileNotificationReceiver](/javascript/api/azure-iothub/client?#azure-iothub-client-getfilenotificationreceiver). Supply the name of a file upload callback method that are called when notification messages are received.
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* Process file upload notifications in the callback method.
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1. Call [getFileNotificationReceiver](/javascript/api/azure-iothub/client?#azure-iothub-client-getfilenotificationreceiver). Supply the name of a file upload callback method that are called when notification messages are received.
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1. Process file upload notifications in the callback method.
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This example sets up a `receiveFileUploadNotification` notification callback receiver. The receiver interprets the file upload status information and prints a status message to the console.
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Follow this procedure to upload a file from a device to IoT hub:
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* Connect to the device
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* Get Blob Storage information
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* Upload the file to Blob Storage
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* Notify IoT hub of upload status
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1. Connect to the device
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1. Get Blob Storage information
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1. Notify IoT hub of upload status
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### Import libraries
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### Connect to the device
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Call [create_from_connection_string](/python/api/azure-iot-device/azure.iot.device.iothubdeviceclient?#azure-iot-device-iothubdeviceclient-create-from-connection-string) to add the device primary connection string. See the prerequisites section for how to look up the device primary connection string.
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To connect to the device:
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Then call [connect](/python/api/azure-iot-device/azure.iot.device.iothubdeviceclient?#azure-iot-device-iothubdeviceclient-connect) to connect the device client.
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1. Call [create_from_connection_string](/python/api/azure-iot-device/azure.iot.device.iothubdeviceclient?#azure-iot-device-iothubdeviceclient-create-from-connection-string) to add the device primary connection string.
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1. Call [connect](/python/api/azure-iot-device/azure.iot.device.iothubdeviceclient?#azure-iot-device-iothubdeviceclient-connect) to connect the device client.
* Use [from_blob_url](/python/api/azure-storage-blob/azure.storage.blob.blobclient?#azure-storage-blob-blobclient-from-blob-url) to create a [BlobClient](/python/api/azure-storage-blob/azure.storage.blob.blobclient?#azure-storage-blob-blobclient-from-blob-url) object from a blob URL.
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* Call [upload_blob](/python/api/azure-storage-blob/azure.storage.blob.blobclient?#azure-storage-blob-blobclient-upload-blob) to upload the file into the Blob Storage.
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1. Use [from_blob_url](/python/api/azure-storage-blob/azure.storage.blob.blobclient?#azure-storage-blob-blobclient-from-blob-url) to create a [BlobClient](/python/api/azure-storage-blob/azure.storage.blob.blobclient?#azure-storage-blob-blobclient-from-blob-url) object from a blob URL.
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1. Call [upload_blob](/python/api/azure-storage-blob/azure.storage.blob.blobclient?#azure-storage-blob-blobclient-upload-blob) to upload the file into the Blob Storage.
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This example parses the `blob_info` structure to create a URL that it uses to initialize an [BlobClient](/python/api/azure-storage-blob/azure.storage.blob.blobclient). Then it calls `upload_blob` to upload the file into Blob Storage.
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