cron

I like it :) Can you provide a link to the sensors you used?

You‘re supposed to host this yourself.

Set the DNS cache time to 60 seconds.

Set the script to run on every host delayed by some time to avoid simultaneously accessing the API (e.g. run the script every other minute).

With this approach, you get automatic failover in at most 3 minutes.

I'd host it on both webservers. The script sets the A record to all the servers that are online. Obviously, the script als has to check it's own service.

It seems a little hacky though, for a business use case I would use another approach.

OP said that they have a static website, this eliminates the need for session sync.

Your challenge is that you need a loadbalancer. By hosting the loadbalancer yourself (e.g. on a VPS), you could also host your websites directly there...

My approach would be DNS-based. You can have multiple DNS A records, and the client picks one of them. With a little script you could remove one of the A Records of that server goes down. This way, you wouldn't need a central hardware.

This kind of spam is luckily pretty rare in europe, I get maybe one or two spam calls a year.

For a start, try hosting something in your own home. A raspberry or an older PC or laptop should be enough.

My first projects were a print server (so I can print via wifi) and a file server. Try to find something that is useful for you.

Only start hosting on the internet when you've learned the basics and have more experience.

Maybe because many streaming services have locked their 4k content behind some specific apps and platforms and offer lower resolutions on general desktop PCs.

Generally, we (sadly) see smart monitors come up like smart TVs did ten years ago.

Some noteable features include streaming apps (netflix...) and wireless screen mirroring from phones.

Really? At least 90% of packets I get are deposited without signature.

I think it is necessary to make a difference between delivering cheap stuff and a new iPhone or laptop.