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Fix EXXX values defined in Microsoft C Runtime 10
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Thanks to Bernhard Agthe.
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Avoid incompatibility with GPLv2 program. This change has been approved by Tobias Doerffel, Florian octo Forster and Hannu Vuolasaho.
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Inspired by the branch ff/ipv6 of Florian Forster but this version uses a specific PI backend to isolate the IPv4 and IPv6 implementations. The existing TCP/IPv4 implementation has been kept intact (not rebased on the PI one) because its data backend requires fewer bytes than the PI. New functions modbus_new_tcp_pi, modbus_tcp_pi_listen and modbus_tcp_pi_accept and new backend called modbus_tcp_pi_t.
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These functions have no meaning in RTU so it's better to specialize the names and remove them from the backend. - remove the functions from the backend - update tests to handle RTU mode (master and slave) - add command line options to tests (rtu or tcp)
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- move termios header in RTU backend - move TCP headers in TCP backend - use native serial on Win32 for Cygwin - avoid too many defines
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This change fixes a compilation problem in MinGW. As general rule, each header must be as independent as possible.
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All private functions and constants are now prefixed by _. The modbus protocol uses entry points to call specific functions.