- NimBLE-Arduino 2.5.1, BLE work in a background task on core 0 - LVGL 9 UI for the round screen: device list (OBD-like devices in green), tap to list services/characteristics, ELM test (ATZ/ATE0/ATI/ATRV/0100) - results saved to LittleFS /ble_log.txt; serial d/c/s commands - shared lv_conf: Montserrat 16 and 20 enabled Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>