I was responding to a post on a forum about pfSense and Ubiquiti and how they get along (very well, thank you) and it occurred to me that I left part of the story hanging.
When last we left our heroes, I had kinda iffy WiFi coverage in the house with the new gear, compared to the old gear, but I had all the desired VLANs working. The solution, or at least the obvious solution, was to further finance the purchase of more Bentleys for Robert Pera by upgrading my APs.
As you may (or may not) recall, one problem I had was that stationary devices in the house would suddenly feel the need to roam and managed to connect to the AP out in workshop. The workshop was so distant that shortly they would roam off it and the only other option was back to the AP in the house again. Vicious cycle ensues, cat and dogs, etc.
Well, the new APs arrived. I initially connected and tested by laying them about on desktops, but quickly got serious and ran wire for the main one to be deployed in the kitchen ceiling. The whole WiFi thing in the house got much better.
It is not without the occasional mystery, however. I have an apparently not terribly smart WiFi device that is the intermediate display panel for my Accurite weather station. The suite of weather sensors outside communicates via a 433MHz signal to the display panel, which in turn connects to my LAN via WiFi and kicks the data out to WeatherUnderground. This WiFi device is literally 15 feet line of sight, with no obstacles, from the kitchen AP. As I type this, the display panel is within reach of my left arm and the AP is two steps away. Consequently, this stupid display panel will connect only to the hallway AP on the other side of the house and ONLY that AP. I have tried every conceivable way to reset the display panel and the APs. The only combination that will work is if the hallway AP is online and accepting the Accurite panel. Nothing seems to make it forget the hallway AP and connect to the much closer kitchen AP.