Well, then let me tell you about my first hurdle.
1) I decided to power most of them off USB chargers, as we have hundred (literally) of them around and they all have 5v 1a output. The network ports and the power plugs are near each other but nowhere near the AC unit, and I need to take temp of the ac air and the room. So... long lead?
2) These devices will not be secure in any sense of the word, so they should end up on their own VLAN and have no connectivity to the internet except.... it would be SO much easier to have them all dump data to a google sheet (found that here https://www.open-electronics.org/how-se ... readsheet/
) and then use something like appsheet.com to change it into a mobile readable "app". Given my personal drive to reduce attack surface, it will probably end up with a locally hosted version of openhab or sparkfun data and I will simply need to put more time in on it.
3) Being an occasional repeat beginner (I occasionally return to arduino to start yet another project) I find myself relearning what I learned two years ago. For instance, did you know its possible to burn a thermister by not paying attention to what you hook it up to?
Ill return here occasionally and let you know what else I burn.