tliu93
3e04b15656
- Add CHINT DDSU666 profile (ddsu666.yaml): FC03 holding registers, voltage/ current/active power (kW)/reactive power (kvar)/PF/frequency, import+export active energy. Word/byte order left at big-endian as a documented best guess (manual has no float example) — to be confirmed on-device. - Add DDSU666-Modbus-Protocol.md reference extracted from the official manual, plus the source PDF (parity with the SDM120 reference). - Generalize driver.read_blocks to dispatch FC03 (holding) or FC04 (input) based on a function_code argument (default 4, SDM120 behaviour unchanged); the code is validated before any connection is attempted. - Wire profile.function_code through the CLI read command, the background poller, and the device /test endpoint — previously the profile field was declared but never honoured (read path was hardcoded to FC04). - Tests: default -> FC04, function_code=3 -> FC03 holding, invalid FC rejected before connecting.