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Are there any standard practice/procedures/tools to perform a software update (OTA) of my c++ application across thousands of battery powered IoT nodes.

I don't want to reinvent something, and wondering if a proven/standard tool or solution already exits. Ideally something that would be power fail-safe.

Edit:

I would like to make a custom smart-speaker (Alexa or Google Home) type devices, powered by battery, using RPi Zero W

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    Where comes a Raspberry Pi to play? Do you have thousands of battery powered RasPis? – Ingo Nov 15 '18 at 19:47
  • I don't have them today. I would like to make smart speaker (Alexa) type devices, powered by battery, using RPi Zero W – hassan789 Nov 15 '18 at 23:47
  • you might want to look into dev-ops tools such as puppet. – oh.dae.su Nov 18 '18 at 6:56
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The professional OTA updaters include: Mender, rauc, swupdate

These are power fail safe, as they do an "A/B" update. Two images: A and B, where A is the current running image stays flashed, until the new B image is confirmed to be flashed in the OTA partition.

The following presentation gives a good overview of differences between pushing debugging images, ci images, and production images: https://www.youtube.com/watch?v=rCDZVjHHC6o

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