File Upload from Cloud to Azure IoT Edge Device

Amol Ingale 21 Reputation points
2022-08-18T03:59:09.38+00:00

Hi All,

Hope you all doing well,
I am looking to get some pointers in solutioning.
Problem Statement:--
On the IoT Edge Gateway or an Edge Device where modules are running as containers along side Edge Hub and Edge Runtime.
I need to get the modules reload when it gets a new file (this is quite achievable via Microsoft.Extensions.Configuration) but most important for me is to find a way to push a file on the Edge device from Cloud, please note this is not something from device to Cloud where there are solutions available like IOT Hub File upload but instead the requirement is other way round.

Could you provide some inputs on it????

Appreciate !!!

Kr.
Amol

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Accepted answer
  1. Sander van de Velde 28,711 Reputation points MVP
    2022-08-18T21:44:36.04+00:00

    Hello @Amol Ingale ,

    So you want to have files being copied from cloud to edge.

    In general, devices should only make outbound connections.

    So, you cannot expose an inbound endpoint but some logic on the edge needs to be executed so it gets retrieves the file.

    On the other hand, exposing a file to be downloaded from anywhere in the world without security is also not handy.

    A few scenarios occur:

    • a module gets a desired property as a trigger to download a file from Azure blob storage (it needs storage credentials like a sas token from a blob)
    • a module gets a desired property as a trigger to download a file exposed by eg an Azure Function (again credentials need to be shared)

    Because the IoT Edge device already has a secure 'channel' with the cloud it can request and exchange (temporary) secrets in many ways (sending telemetry request, direct methods, cloud messages, )

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  1. chbeier 1,866 Reputation points
    2022-08-19T13:08:51.93+00:00

    Besides the scenarios Sander mentioned, you might implement a direct method "downloadMe" on the device and call it from your cloud app with the SAS URI as payload. The benefit is immediate response on execution and control to your cloud app when the download should happen.

    While the maximum payload size of 120KB should be sufficient in most cases, review the throttling limits. IoT Hub S1 supports at max 40 direct method calls per second (160KB/sec/unit).

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