Peter M. Groen / libmodbus

Original patch by Sisyph (eric-paul).

Page 23 of Modbus_Messaging_Implementation_Guide_V1_0b

The function was used only one time.

The ID used at init time will be the device ID of the caller and
the server ID in request functions is the target to reach.

The library is now simpler to include (only one <modbus.h>)
To avoid confusion MB_VERSION defines have been renamed to
LIBMODBUS_VERSION.

This reverts commit df0cf7927249954f15e0aa85b02d21b990fa9af9.
Use <modbus.h> in tests.

This time the change is definitive :)

I don't want to put a burden on build system support anymore

Requests not to send SIGPIPE on errors on stream oriented sockets
when the other end breaks the connection.

The previous implementation dereferenced a type-puned pointer, which is
illegal according to ANSI C. Some newer versions of GCC will complain
about this. This implementation uses "memcpy" to avoid this problem.

- the return value is used to pass the message length
- remove the hack on exception check in modbus receive
- update tests

It occurs on first occurence of slave timeout (found with Valgrind 3.3.0).
Reported by Henrik Munktell.

- simpler wscript_build files
- reuse VERSION
- add path to config.h

Reported by Henrik Munktell.

- adjusts various comments on return values
- updated tests
- added entry to MIGRATION

Reported and tested by Yishin Li.

Real fix #333455 - IPTOS_LOWDELAY not supported on cygwin
Thank to Yishin Li for the better problem description.

- check IPTOS_LOWDELAY define in configure
- generate a config.h
- include the generated config.h in modbus.c

- new function modbus_flush
- new names and values for error defines
- finer recovery on error
- merge TOO_MANY_DATA and INVALID_DATA
- stop unit-test-master at the first error
- FLUSH_OR_RECONNECT_ON_ERROR -> FLUSH_OR_CONNECT_ON_ERROR
- more precise tests in unit-test-master

- same values (2)
- man of socket() says PF_INET (packet family)
- AF_INET (address family) for addresses

- MAJOR changes to the API (see MIGRATION)
- New unit tests
- Removed TODO list
- Updated NEWS & MIGRATION files

The maximum length of the ADU is 260 in TCP not 256.

Improve the conformance to the Modbus protocol.
MAX_STATUS: 800 -> 2000
MAX_REGISTERS: 100 -> 125

This change improves the conformance with the PDU and ADU definitions of the
Modbus protocol and reduces the number of additions.

- upgrade to WAF 1.5.3
- smaller WAF scripts
- fix using of modbus.h with WAF
- updated configure.ac and Makefile.am files
- change include paths in test files

- separate tests directory
- regroup modbus.h and modbus.c in the same dir
- updated waf scripts
- updated autotools files
- bump application version to 1.9.0
- bump library number to 2.0.0

- modbus.[ch] are LGPL
- test-modbus-master.c and test-modbus-slave.c are GPL