Eduard Iten b543579393 feat(modbus): Add supply voltage register and display in tool ...

This commit introduces a new Modbus input register for the system's supply voltage.

- The `modbus-registers.de.md` documentation is updated to include the `SUPPLY_VOLTAGE_MV` register at address `0x00F5` within the system block.
- The `modbus_server.h` header defines the new register.
- The `modbus_server.c` implementation provides a fixed value (12300 mV) for this register.
- The `modbus_tool.py` script is updated to read and display this new supply voltage value in the UI.

This lays the groundwork for integrating actual voltage measurements in the future.

2025-07-03 18:47:48 +02:00

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