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liblightmodbus is very simple and lightweight C library for Modbus RTU protocol communication.
Library is targeted to run on small devices too (such as micro controllers) and basically everything that you have C compiler for.
Currently liblightmodbus supports all basic Modbus protocol functions.
Library is targeted to run on small devices, such as microcontrollers.
Take a look at examples folder. It's so easy, that this should be enough. If you need more explanation though, feel free to email me. It'd be nice to see that someone is interested
If that's not enough, description of each function or data structure can be found in manpages installed on your system with liblightmodbus-dev package (or in man folder)