If someone is interested, some comments on my home setup (about 4-5 years of continuous tinkering) I have FTTH (France) and the first thing I did is to replace

If someone is interested, some comments on my home setup (about 4-5 years of continuous tinkering) I have FTTH (France) and the first thing I did is to replace the ISP-provided router. They are really poor quality. I bought a Ubiquity ER-4 and, retroactively, I should have bought a mini fanless PC and run Debian on it. Why Deian and not OpenSense or something like that? Because I have control over the very limited services I will use on the router, namely routing, firewalling and dnsmasq for DHCP and DNS. It is difficult to keep up with the security / functionality otherwise. Teh worst is a closed archaic system such as the one on the Ubiquity ER-4. A step up is something more dynamic such as OpenSense or similar. If you have the will to learn a bit of Linux Debian is the cleanest solution. Again - this is really for a very small set of service you will almost never touch. Behind the ER-4 there is a switch that powers a few end user PCs, a PoE port for a Ubiquity Unifi WiFi access point and a server The Unifi AP is fantastic. This is such an extreme upgrade vs the ISP provided one that I cannot imaging going back. Really invest in a higher-range consumer AP. In my apartment I used to have along the rooms (more or less linearly) 4, then 2 then 1 and 0-1 "wifi bars" (roughly the quality of reception). I now have, for the same emission power, 4 4 4 3 Then the server. There are two basic parts on it: the "services" part and the "home automation" part. The services are things (web sites, MQTT, ...) that are run exclusively from Docker. I tested the recovery of the whole system from only the backups (of the configuration (docker-compose.yaml) and the non-volatile volumes) and it took me 1 hour from "I do not have any documentation, nor ISO" to "the lights work again"). Docker is a life saver here. Backups with Borg. The second part on the server is home automation: a docker container for Home Assistant and a USB dongle for Zigbee. I then have Zigbee and Wi-Fi devices all over the appartment to get rid of fixed wall switches. Plus automation. What I would have done differently? A mini PC instead of the ER-4, two electrical wires in the wall (phase and neutral). What I will do in the future? A redundant setup for home automation (this is not simple at all). I would love to get some feedback for those who are more experienced or went though things they would do differently, or again.