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A class to manage Modbus frames and another to make a Modbusserver. Both classes are fully portable. An example of a modbusserver is given. The code is very simple and comprehensive.
Note ; Qt includes some classes related to Modbus since Qt 5.6.
QSCADA will be an open source SCADA application generator for Linux O.S. The IDE will allow to visually design the application and will generate the code for the server and client parts. Modbus for Linux and Qt library will be used.