In this note I will not provide the full code for all components, I will only give snippets and tips on what to pay attention to when assembling a site on jekyll.

File modification time

Every page has at least three timestamp points in different files, page elements, or server responses, and they must all be the same.

• ld+json "dateModified": "2025-03-07T15:43:42+00:00"
• sitemap <lastmod>2025-03-07T15:43:42+00:00</lastmod>
• headres last-modified: Fri, 07 Mar 2025 15:43:42 GMT

Looking for whatever with low power consumption.
Found modules on mediatek, download documentation for SoM (System on Module).
You scroll through in search of how much the chip consumes.

What did the embedded system look like?

There is one small CubieBoard 2 next to the small router.
And there is no physical access to them.
A USB-UART is connected to a router controlled by LEDE, the pins of which are connected to CubieBoard2.
Both the router and CubieBoard2 are accessible via ssh.

It was the presence of UART in the assembly that allowed us to raise the fallen CubieBoard2 remotely.

How did it fail?

One day a regular update of the Debian kernel arrives
linux-image-4.9.0-8-armmp-lpae.
After the update the system stops responding.

How is this usually done?

Everything is simple here, you take out the microsd card, and then there is no need to describe it further.