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Modbus modification for multiple holding registers to write float on eurotherms

Yves Watier requested to merge modouibus into master

Small modification to add Modbus tcp 'function code 16' which allow multiple holding registers to be written.

This allows for example to have a temperature setpoint with decimals on eurotherms.

If needed I can make it much more generic for other equipment, but to my knowledge its good enough for now.

Edited by Yves Watier

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