Peter M. Groen / libmodbus

- 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

- detected by autoscan
- uintX_T
- added functions

- 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

- use milliseconds instead of microseconds
- increase the number of loops to 100 000 from 10 000

- remove header and checksum length from modbus_param_t
- use new const tables

- new functions modbus_slave_init_listen_tcp, modbus_slave_accept_tcp,
  modbus_slave_slave_receive.
- removed printf in modbus.c: 'Connection closed'
- new slave test, bandwith-slave-many-up
- updated build scripts
- updated MIGRATION document file

- use strerror instead of error number

Thanks to Justin Carroll to have reported and tested my patch.

Invalid error check in modbus_init_listen_tcp

- Add many comments to receive_msg and modbus_receive functions.
- The use of response_length for good response was confusing.

- Return test on read and recv slightly more robust
- Fix a comment

- code is easier to understand
- code is bit faster.

This new value isn't appropriate for a serial link.