My Gateway currently runs on a Raspi 3. Which works well but I’m concerned about disk writes killing the micro SD card. Right now it looks like the Gateway is written assuming that disk writes aren’t a problem (voluminous syslogs, SQLite activity, logging for graphs, etc.)
But disk writes are a big problem when running on Raspi SD cards. Mounting an external drive on a Raspi is an expensive kludge. Raspis aren’t designed for 24/7/multiple-years use cases.
One way to sidestep disk writes being a problem is to use a conventional PC. A refurb PC doesn’t cost much more than a Raspi, assuming you buy everything new and maybe need an powered external USB hub to support power hungry dongles. Real good business class refurb PCs are in the $90 range.
It isn’t that difficult to install a, say, Debian distro onto a refurb. But what is daunting is your instructions for installing the Gateway software .
Using a cheap refurb would be more attractive if there was a way of installing the gateway on a standard Linux distro with a single
apt install. Or (better yet) custom roll a Debian distro with the gateway bundled, like you are now doing with the Raspis.