Watching the board without a cable
Until now, seeing what the board was doing meant plugging it into a computer and opening the Serial Monitor. That's fine at a desk and awkward once the board is mounted where it belongs.
A live log on your network
Firmware 0.2.8 serves its output on a small web page on your home network, at an address like tcgmarquee-4f2a.local. The page updates every second and keeps the last 32 KB of output, with pause, clear, and auto-scroll. It marks when the board restarts, so you can watch an update install, restart, and confirm itself from across the room.
Kept simple, for now
The page has no password, so it's a testing tool, and it will be off in the firmware that ships to customers. It never shows the board's device key or your Wi-Fi password.
The longer-term plan is logs sent to the server, turned on per account for a set time when someone needs help, and off the rest of the time. The board already keeps its recent output, so that's a small step from here.