sunspec Directory Reference

Files
	sunspec.cpp
	SunSpec Modbus model-chain walker + point readers + map writer (pure, host-tested).
	sunspec.h
	SunSpec Modbus device-information-model codec (DETWS_ENABLE_SUNSPEC) - zero-heap model-chain walker + register-point readers and a map builder, layered on the holding-register model so a solar inverter / meter / battery is interoperable.