Check-in of initial, unmodified freemodbus-v1.5.0

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4960 42af7a65-404d-4744-a932-0658087f49c3

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diff --git a/apps/modbus/README.txt b/apps/modbus/README.txt
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+apps/modbus README
+==================
+
+This directory contains a port of last open source version of freemodbus
+(BSD license).  The code in this directory is a subset of freemodbus version
+1.5.0 (June 6, 2010) that can be downloaded in its entirety from http://developer.berlios.de/project/showfiles.php?group_id=6120.
+
+Directory Structure/Relation to freemodbus-v1.5.0
+-------------------------------------------------
+
+The original freemodbus download consists of several directories.  This
+subset takes only the contents of one directory, modbus/, that implements
+the core modbus logic and integrates that directory into the NuttX build
+system.  The mapping between freemodbus-v1.5.0 and the nuttx directories
+is shown below:
+
+  --------------------------- ----------------------------------------------
+  freemodbus-v1.5.0           Nuttx
+  --------------------------- ----------------------------------------------
+  All top level .txt files    Not included
+  demo/                       Not included.  This directory contains demo
+                              and porting code for a variety of platforms.
+                              The NuttX demo was ported from the the LINUX
+                              demo in this director and can be found at
+                              apps/examples/modbus.
+  doc/                        Note included.  This directory contains Doxygen
+                              support files.
+  modbus/                     Included in its entirety in various locations:
+         ascii                  apps/modbus/ascii
+         functions              apps/modbus/functions
+         include                apps/include/modbus
+         mb.c                   apps/modbus/mb.c
+         rtu                    apps/modbus/rtu
+         tcp                    apps/modbus/tcp
+  tools/                      Note included.  This directory contain Doxygen
+                              tools.
+  --------------------------- ----------------------------------------------
+
+So this directory is equivalent to the freemodbus-v1.5.0/modbus
+directory except that (1) it may include modifications for the integration
+with NuttX and (2) the modbus/include directory was moved to apps/modbus.
+
+The original, unmodified freemodbus-v1.5.0 was checked in as SVN revision
+4937
+
+The other directory here, nuttx/, implements the NuttX modbus interface.
+It derives from the freemodbus-v1.5.0/demo/LINUX/port directory.
+
+Note
+====
+
+The developer of freemodbus, Christian Walter, is still developing Modbus
+libraries, although they are now commercial.  See
+http://www.embedded-solutions.at/ for further information.