Please, don't send direct emails to Stéphane Raimbault unless you want commercial support.
Take care to read the documentation at http://libmodbus.org/documentation/.
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Be sure it's a bug before creating an issue, in doubt, post a message on https://groups.google.com/forum/#!forum/libmodbus or send an email to libmodbus@googlegroups.com
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Use a clear and decriptive title for the issue to identify
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Which version of libmodbus are you using? you can obtain this information from your package manager or by running
pkg-config --modversion libmodbus. You can provide the sha1 of the commit if you have fetched the code withgit. -
Which operating system are you using?
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Describe the exact steps which reproduce the problem in as many details as possible. For example, the software/equipement which runs the Modbus server, how the clients are connected (TCP, RTU, ASCII) and the source code you are using.
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Enable the debug mode, libmodbus provides a function to display the content of the Modbus messages and it's very convenient to analyze issues (http://libmodbus.org/docs/latest/modbus_set_debug.html).
Good bug reports provide right and quick fixes!