v3.1.1

More robust to exploits, more compliant and better handling of connect/close
sequences. Windows support still broken.

• New unit tests
• Fix remote buffer overflow vulnerability (closes #25, #105)
• Explain how to define response timeouts when many RTU slaves
• Fix receiving of incorrect queries in write_single and
  mask_write_register. Thanks to James Nutaro.
• Check return value of autoreconf. Thanks to Lauri Nurmi.
• Constant for broacast and test ordering
• Fix the fix of device string check
• Various changes to try to improve broken Windows support
• Try to fix MinGW compilation
• Portable use of bswap_32
• Improve support of MacOS X
• Fix socket value on init/close
• Returns -1 on invalid mode in modbus_rtu_set_rts
• Protect all public functions against invalid context
• Sleep for delay of response timeout before reconnect (closes #77). Thanks to Karl Palsson.
• Baud rate until 4,000,000 (POSIX), 1,000,000 (Windows) (closes #93)
• New modbus_get|set_float_dcba to get|set float in inversed byte order
• Remove unsupported -Wtype-limits for GCC < 4.3.5 (closes #109).
• Enable out-of-source build. Thanks to Yegor Yefremov.
• Fix alignment problem on ARMv5 platform
• Improvement to Debian package. Thanks to Alexander Klauer.
• Improve support of VS 2005. Thanks to Petr Gladkiy.
• Add documentation for modbus_mask_write_register (closes #91). Thanks to Martijn de Gouw.
• Avoid C99 declaration in win32 section code (closes #92). Thanks to oldfaber and endrelovas.
• Add a windows scripting host configure file. Thanks to oldfaber and Stéphane Raimbault.
• Fix typo in modbus_strerror documentation. Thanks to Mirko Rajkovaca.
• Rename reserved C++ keywords of modbus_mask_write_register. Thanks Tobias Doerffel.
• Another quick workaround for deficient OS (closes #63)
• Add support for Mask Write Register
• Fix missing close on socket in random-test-server. Thanks to Damian Zieliński.
• Use nonblocking sockets on Win32 and OS X/iOS too. Thanks to Julian Raschke.
• Fix all compilations warnings spotted by new compilation flags
• Major update of build system
• Calculate RTS activation time by send length
• Dynamic memory allocation of device name (closes #11)
• Add unit tests for modbus_mapping_new
• Add Visual Studio 2008 project files by oldfaber
• Fix missing argument in synopsis section of modbus_rtu_set_serial_mode
• Fix wrong constant names to create version number
• More compilation fixes for Windows by oldfaber.
• Fix wrong constant names to create version number. Thanks to Denis Davydov.

All changes w/o attribution by @stephane