the comparison is part of the original library code, but the compiler
rightfully complains that the comparison byte <= 0xFF is always true,
since byte is uint8_t. the comparison was commented out, and is now
removed.
avoid additional conversions and avoid double for the fact that
calculations on type double are implemented in software, whereas
float is handled in hardware on ESP32.
* add support for energy & power readings on SML based power meters, taking OBIS 16.7.1 for power (using mod. SML Parser lib. by olliiiver)
* switched SML read to use software serial
* made total power meter response controled by meter source to obtain either the sum of phase powers or explicit total power provided by meter
* made mqtt subscriptions to power meter topics meter source dependend
* simplified SML read loop and OBIS handler registration, + minor refactoring
* minor cleanup/style changes and optim. PowerMeter
* fixed build, add SOURCE_SML == 4
* removed optional usage of HW serial for SML power meter
* switched to usage of _powerMeter1Power for SML power reading to allign better with existing code
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Co-authored-by: helgeerbe <helge@erbehome.de>
