Qt5 comes with the modbusTCP class to achieve the Modbus TCP communication, the program contains the client and server, the development environment for ubuntu16.04+Qt5.6.1, such as the server does not open, please compile the program run with sudo.

QtmodbusTCP
...........\ModbusTcpClient
...........\...............\main.cpp
...........\...............\ModbusTcpClient.cpp
...........\...............\ModbusTcpClient.h
...........\...............\ModbusTcpClient.pro
...........\...............\ModbusTcpClient.pro.user
...........\...............\ModbusTcpClient.ui
...........\ModbusTcpServer
...........\...............\main.cpp
...........\...............\ModbusTcpServer.cpp
...........\...............\ModbusTcpServer.h
...........\...............\ModbusTcpServer.pro
...........\...............\ModbusTcpServer.pro.user
...........\...............\ModbusTcpServer.ui

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