Initial commit

3 files changed, 915 insertions, 0 deletions

diff --git a/tests/unit-test-client b/tests/unit-test-client
new file mode 100755
index 0000000..4e2b561
--- /dev/null
+++ b/tests/unit-test-client
@@ -0,0 +1,225 @@
+#! /bin/bash
+
+# unit-test-client - temporary wrapper script for .libs/unit-test-client
+# Generated by libtool (GNU libtool) 2.4 Debian-2.4-3
+#
+# The unit-test-client program cannot be directly executed until all the libtool
+# libraries that it depends on are installed.
+#
+# This wrapper script should never be moved out of the build directory.
+# If it is, it will not operate correctly.
+
+# Sed substitution that helps us do robust quoting.  It backslashifies
+# metacharacters that are still active within double-quoted strings.
+sed_quote_subst='s/\([`"$\\]\)/\\\1/g'
+
+# Be Bourne compatible
+if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then
+  emulate sh
+  NULLCMD=:
+  # Zsh 3.x and 4.x performs word splitting on ${1+"$@"}, which
+  # is contrary to our usage.  Disable this feature.
+  alias -g '${1+"$@"}'='"$@"'
+  setopt NO_GLOB_SUBST
+else
+  case `(set -o) 2>/dev/null` in *posix*) set -o posix;; esac
+fi
+BIN_SH=xpg4; export BIN_SH # for Tru64
+DUALCASE=1; export DUALCASE # for MKS sh
+
+# The HP-UX ksh and POSIX shell print the target directory to stdout
+# if CDPATH is set.
+(unset CDPATH) >/dev/null 2>&1 && unset CDPATH
+
+relink_command="(cd /home/jmccrohan/bin/libmodbus/tests; { test -z \"\${LIBRARY_PATH+set}\" || unset LIBRARY_PATH || { LIBRARY_PATH=; export LIBRARY_PATH; }; }; { test -z \"\${COMPILER_PATH+set}\" || unset COMPILER_PATH || { COMPILER_PATH=; export COMPILER_PATH; }; }; { test -z \"\${GCC_EXEC_PREFIX+set}\" || unset GCC_EXEC_PREFIX || { GCC_EXEC_PREFIX=; export GCC_EXEC_PREFIX; }; }; { test -z \"\${LD_RUN_PATH+set}\" || unset LD_RUN_PATH || { LD_RUN_PATH=; export LD_RUN_PATH; }; }; { test -z \"\${LD_LIBRARY_PATH+set}\" || unset LD_LIBRARY_PATH || { LD_LIBRARY_PATH=; export LD_LIBRARY_PATH; }; }; PATH=/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11; export PATH; gcc -g -O2 -g -O2 -Wall -Werror -o \$progdir/\$file unit-test-client.o  ../src/.libs/libmodbus.so -Wl,-rpath -Wl,/home/jmccrohan/bin/libmodbus/src/.libs)"
+
+# This environment variable determines our operation mode.
+if test "$libtool_install_magic" = "%%%MAGIC variable%%%"; then
+  # install mode needs the following variables:
+  generated_by_libtool_version='2.4'
+  notinst_deplibs=' ../src/libmodbus.la'
+else
+  # When we are sourced in execute mode, $file and $ECHO are already set.
+  if test "$libtool_execute_magic" != "%%%MAGIC variable%%%"; then
+    file="$0"
+
+# A function that is used when there is no print builtin or printf.
+func_fallback_echo ()
+{
+  eval 'cat <<_LTECHO_EOF
+$1
+_LTECHO_EOF'
+}
+    ECHO="printf %s\\n"
+  fi
+
+# Very basic option parsing. These options are (a) specific to
+# the libtool wrapper, (b) are identical between the wrapper
+# /script/ and the wrapper /executable/ which is used only on
+# windows platforms, and (c) all begin with the string --lt-
+# (application programs are unlikely to have options which match
+# this pattern).
+#
+# There are only two supported options: --lt-debug and
+# --lt-dump-script. There is, deliberately, no --lt-help.
+#
+# The first argument to this parsing function should be the
+# script's ../libtool value, followed by no.
+lt_option_debug=
+func_parse_lt_options ()
+{
+  lt_script_arg0=$0
+  shift
+  for lt_opt
+  do
+    case "$lt_opt" in
+    --lt-debug) lt_option_debug=1 ;;
+    --lt-dump-script)
+        lt_dump_D=`$ECHO "X$lt_script_arg0" | /bin/sed -e 's/^X//' -e 's%/[^/]*$%%'`
+        test "X$lt_dump_D" = "X$lt_script_arg0" && lt_dump_D=.
+        lt_dump_F=`$ECHO "X$lt_script_arg0" | /bin/sed -e 's/^X//' -e 's%^.*/%%'`
+        cat "$lt_dump_D/$lt_dump_F"
+        exit 0
+      ;;
+    --lt-*)
+        $ECHO "Unrecognized --lt- option: '$lt_opt'" 1>&2
+        exit 1
+      ;;
+    esac
+  done
+
+  # Print the debug banner immediately:
+  if test -n "$lt_option_debug"; then
+    echo "unit-test-client:unit-test-client:${LINENO}: libtool wrapper (GNU libtool) 2.4 Debian-2.4-3" 1>&2
+  fi
+}
+
+# Used when --lt-debug. Prints its arguments to stdout
+# (redirection is the responsibility of the caller)
+func_lt_dump_args ()
+{
+  lt_dump_args_N=1;
+  for lt_arg
+  do
+    $ECHO "unit-test-client:unit-test-client:${LINENO}: newargv[$lt_dump_args_N]: $lt_arg"
+    lt_dump_args_N=`expr $lt_dump_args_N + 1`
+  done
+}
+
+# Core function for launching the target application
+func_exec_program_core ()
+{
+
+      if test -n "$lt_option_debug"; then
+        $ECHO "unit-test-client:unit-test-client:${LINENO}: newargv[0]: $progdir/$program" 1>&2
+        func_lt_dump_args ${1+"$@"} 1>&2
+      fi
+      exec "$progdir/$program" ${1+"$@"}
+
+      $ECHO "$0: cannot exec $program $*" 1>&2
+      exit 1
+}
+
+# A function to encapsulate launching the target application
+# Strips options in the --lt-* namespace from $@ and
+# launches target application with the remaining arguments.
+func_exec_program ()
+{
+  for lt_wr_arg
+  do
+    case $lt_wr_arg in
+    --lt-*) ;;
+    *) set x "$@" "$lt_wr_arg"; shift;;
+    esac
+    shift
+  done
+  func_exec_program_core ${1+"$@"}
+}
+
+  # Parse options
+  func_parse_lt_options "$0" ${1+"$@"}
+
+  # Find the directory that this script lives in.
+  thisdir=`$ECHO "$file" | /bin/sed 's%/[^/]*$%%'`
+  test "x$thisdir" = "x$file" && thisdir=.
+
+  # Follow symbolic links until we get to the real thisdir.
+  file=`ls -ld "$file" | /bin/sed -n 's/.*-> //p'`
+  while test -n "$file"; do
+    destdir=`$ECHO "$file" | /bin/sed 's%/[^/]*$%%'`
+
+    # If there was a directory component, then change thisdir.
+    if test "x$destdir" != "x$file"; then
+      case "$destdir" in
+      [\\/]* | [A-Za-z]:[\\/]*) thisdir="$destdir" ;;
+      *) thisdir="$thisdir/$destdir" ;;
+      esac
+    fi
+
+    file=`$ECHO "$file" | /bin/sed 's%^.*/%%'`
+    file=`ls -ld "$thisdir/$file" | /bin/sed -n 's/.*-> //p'`
+  done
+
+  # Usually 'no', except on cygwin/mingw when embedded into
+  # the cwrapper.
+  WRAPPER_SCRIPT_BELONGS_IN_OBJDIR=no
+  if test "$WRAPPER_SCRIPT_BELONGS_IN_OBJDIR" = "yes"; then
+    # special case for '.'
+    if test "$thisdir" = "."; then
+      thisdir=`pwd`
+    fi
+    # remove .libs from thisdir
+    case "$thisdir" in
+    *[\\/].libs ) thisdir=`$ECHO "$thisdir" | /bin/sed 's%[\\/][^\\/]*$%%'` ;;
+    .libs )   thisdir=. ;;
+    esac
+  fi
+
+  # Try to get the absolute directory name.
+  absdir=`cd "$thisdir" && pwd`
+  test -n "$absdir" && thisdir="$absdir"
+
+  program=lt-'unit-test-client'
+  progdir="$thisdir/.libs"
+
+  if test ! -f "$progdir/$program" ||
+     { file=`ls -1dt "$progdir/$program" "$progdir/../$program" 2>/dev/null | /bin/sed 1q`; \
+       test "X$file" != "X$progdir/$program"; }; then
+
+    file="$$-$program"
+
+    if test ! -d "$progdir"; then
+      mkdir "$progdir"
+    else
+      rm -f "$progdir/$file"
+    fi
+
+    # relink executable if necessary
+    if test -n "$relink_command"; then
+      if relink_command_output=`eval $relink_command 2>&1`; then :
+      else
+	printf %s\n "$relink_command_output" >&2
+	rm -f "$progdir/$file"
+	exit 1
+      fi
+    fi
+
+    mv -f "$progdir/$file" "$progdir/$program" 2>/dev/null ||
+    { rm -f "$progdir/$program";
+      mv -f "$progdir/$file" "$progdir/$program"; }
+    rm -f "$progdir/$file"
+  fi
+
+  if test -f "$progdir/$program"; then
+    if test "$libtool_execute_magic" != "%%%MAGIC variable%%%"; then
+      # Run the actual program with our arguments.
+      func_exec_program ${1+"$@"}
+    fi
+  else
+    # The program doesn't exist.
+    $ECHO "$0: error: \`$progdir/$program' does not exist" 1>&2
+    $ECHO "This script is just a wrapper for $program." 1>&2
+    $ECHO "See the libtool documentation for more information." 1>&2
+    exit 1
+  fi
+fi
diff --git a/tests/unit-test-client.c b/tests/unit-test-client.c
new file mode 100644
index 0000000..533e6a7
--- /dev/null
+++ b/tests/unit-test-client.c
@@ -0,0 +1,690 @@
+/*
+ * Copyright © 2008-2010 Stéphane Raimbault <stephane.raimbault@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <modbus.h>
+
+#include "unit-test.h"
+
+enum {
+    TCP,
+    TCP_PI,
+    RTU
+};
+
+int main(int argc, char *argv[])
+{
+    uint8_t *tab_rp_bits;
+    uint16_t *tab_rp_registers;
+    uint16_t *tab_rp_registers_bad;
+    modbus_t *ctx;
+    int i;
+    uint8_t value;
+    int nb_points;
+    int rc;
+    float real;
+    struct timeval old_response_timeout;
+    struct timeval response_timeout;
+    int use_backend;
+
+    if (argc > 1) {
+        if (strcmp(argv[1], "tcp") == 0) {
+            use_backend = TCP;
+	} else if (strcmp(argv[1], "tcppi") == 0) {
+            use_backend = TCP_PI;
+        } else if (strcmp(argv[1], "rtu") == 0) {
+            use_backend = RTU;
+        } else {
+            printf("Usage:\n  %s [tcp|tcppi|rtu] - Modbus client for unit testing\n\n", argv[0]);
+            exit(1);
+        }
+    } else {
+        /* By default */
+        use_backend = TCP;
+    }
+
+    if (use_backend == TCP) {
+        ctx = modbus_new_tcp("127.0.0.1", 1502);
+    } else if (use_backend == TCP_PI) {
+        ctx = modbus_new_tcp_pi("::1", "1502");
+    } else {
+        ctx = modbus_new_rtu("/dev/ttyUSB1", 115200, 'N', 8, 1);
+    }
+    if (ctx == NULL) {
+        fprintf(stderr, "Unable to allocate libmodbus context\n");
+        return -1;
+    }
+    modbus_set_debug(ctx, TRUE);
+    modbus_set_error_recovery(ctx,
+                              MODBUS_ERROR_RECOVERY_LINK |
+                              MODBUS_ERROR_RECOVERY_PROTOCOL);
+
+    if (use_backend == RTU) {
+          modbus_set_slave(ctx, SERVER_ID);
+    }
+
+    if (modbus_connect(ctx) == -1) {
+        fprintf(stderr, "Connection failed: %s\n",
+                modbus_strerror(errno));
+        modbus_free(ctx);
+        return -1;
+    }
+
+    /* Allocate and initialize the memory to store the bits */
+    nb_points = (UT_BITS_NB > UT_INPUT_BITS_NB) ? UT_BITS_NB : UT_INPUT_BITS_NB;
+    tab_rp_bits = (uint8_t *) malloc(nb_points * sizeof(uint8_t));
+    memset(tab_rp_bits, 0, nb_points * sizeof(uint8_t));
+
+    /* Allocate and initialize the memory to store the registers */
+    nb_points = (UT_REGISTERS_NB > UT_INPUT_REGISTERS_NB) ?
+        UT_REGISTERS_NB : UT_INPUT_REGISTERS_NB;
+    tab_rp_registers = (uint16_t *) malloc(nb_points * sizeof(uint16_t));
+    memset(tab_rp_registers, 0, nb_points * sizeof(uint16_t));
+
+    printf("** UNIT TESTING **\n");
+
+    printf("\nTEST WRITE/READ:\n");
+
+    /** COIL BITS **/
+
+    /* Single */
+    rc = modbus_write_bit(ctx, UT_BITS_ADDRESS, ON);
+    printf("1/2 modbus_write_bit: ");
+    if (rc == 1) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_read_bits(ctx, UT_BITS_ADDRESS, 1, tab_rp_bits);
+    printf("2/2 modbus_read_bits: ");
+    if (rc != 1) {
+        printf("FAILED (nb points %d)\n", rc);
+        goto close;
+    }
+
+    if (tab_rp_bits[0] != ON) {
+        printf("FAILED (%0X = != %0X)\n", tab_rp_bits[0], ON);
+        goto close;
+    }
+    printf("OK\n");
+    /* End single */
+
+    /* Multiple bits */
+    {
+        uint8_t tab_value[UT_BITS_NB];
+
+        modbus_set_bits_from_bytes(tab_value, 0, UT_BITS_NB, UT_BITS_TAB);
+        rc = modbus_write_bits(ctx, UT_BITS_ADDRESS,
+                               UT_BITS_NB, tab_value);
+        printf("1/2 modbus_write_bits: ");
+        if (rc == UT_BITS_NB) {
+            printf("OK\n");
+        } else {
+            printf("FAILED\n");
+            goto close;
+        }
+    }
+
+    rc = modbus_read_bits(ctx, UT_BITS_ADDRESS, UT_BITS_NB, tab_rp_bits);
+    printf("2/2 modbus_read_bits: ");
+    if (rc != UT_BITS_NB) {
+        printf("FAILED (nb points %d)\n", rc);
+        goto close;
+    }
+
+    i = 0;
+    nb_points = UT_BITS_NB;
+    while (nb_points > 0) {
+        int nb_bits = (nb_points > 8) ? 8 : nb_points;
+
+        value = modbus_get_byte_from_bits(tab_rp_bits, i*8, nb_bits);
+        if (value != UT_BITS_TAB[i]) {
+            printf("FAILED (%0X != %0X)\n", value, UT_BITS_TAB[i]);
+            goto close;
+        }
+
+        nb_points -= nb_bits;
+        i++;
+    }
+    printf("OK\n");
+    /* End of multiple bits */
+
+    /** DISCRETE INPUTS **/
+    rc = modbus_read_input_bits(ctx, UT_INPUT_BITS_ADDRESS,
+                                UT_INPUT_BITS_NB, tab_rp_bits);
+    printf("1/1 modbus_read_input_bits: ");
+
+    if (rc != UT_INPUT_BITS_NB) {
+        printf("FAILED (nb points %d)\n", rc);
+        goto close;
+    }
+
+    i = 0;
+    nb_points = UT_INPUT_BITS_NB;
+    while (nb_points > 0) {
+        int nb_bits = (nb_points > 8) ? 8 : nb_points;
+
+        value = modbus_get_byte_from_bits(tab_rp_bits, i*8, nb_bits);
+        if (value != UT_INPUT_BITS_TAB[i]) {
+            printf("FAILED (%0X != %0X)\n", value, UT_INPUT_BITS_TAB[i]);
+            goto close;
+        }
+
+        nb_points -= nb_bits;
+        i++;
+    }
+    printf("OK\n");
+
+    /** HOLDING REGISTERS **/
+
+    /* Single register */
+    rc = modbus_write_register(ctx, UT_REGISTERS_ADDRESS, 0x1234);
+    printf("1/2 modbus_write_register: ");
+    if (rc == 1) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_read_registers(ctx, UT_REGISTERS_ADDRESS,
+                               1, tab_rp_registers);
+    printf("2/2 modbus_read_registers: ");
+    if (rc != 1) {
+        printf("FAILED (nb points %d)\n", rc);
+        goto close;
+    }
+
+    if (tab_rp_registers[0] != 0x1234) {
+        printf("FAILED (%0X != %0X)\n",
+               tab_rp_registers[0], 0x1234);
+        goto close;
+    }
+    printf("OK\n");
+    /* End of single register */
+
+    /* Many registers */
+    rc = modbus_write_registers(ctx, UT_REGISTERS_ADDRESS,
+                                UT_REGISTERS_NB, UT_REGISTERS_TAB);
+    printf("1/5 modbus_write_registers: ");
+    if (rc == UT_REGISTERS_NB) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_read_registers(ctx, UT_REGISTERS_ADDRESS,
+                               UT_REGISTERS_NB, tab_rp_registers);
+    printf("2/5 modbus_read_registers: ");
+    if (rc != UT_REGISTERS_NB) {
+        printf("FAILED (nb points %d)\n", rc);
+        goto close;
+    }
+
+    for (i=0; i < UT_REGISTERS_NB; i++) {
+        if (tab_rp_registers[i] != UT_REGISTERS_TAB[i]) {
+            printf("FAILED (%0X != %0X)\n",
+                   tab_rp_registers[i],
+                   UT_REGISTERS_TAB[i]);
+            goto close;
+        }
+    }
+    printf("OK\n");
+
+    rc = modbus_read_registers(ctx, UT_REGISTERS_ADDRESS,
+                               0, tab_rp_registers);
+    printf("3/5 modbus_read_registers (0): ");
+    if (rc != 0) {
+        printf("FAILED (nb points %d)\n", rc);
+        goto close;
+    }
+    printf("OK\n");
+
+    nb_points = (UT_REGISTERS_NB >
+                 UT_INPUT_REGISTERS_NB) ?
+        UT_REGISTERS_NB : UT_INPUT_REGISTERS_NB;
+    memset(tab_rp_registers, 0, nb_points * sizeof(uint16_t));
+
+    /* Write registers to zero from tab_rp_registers and store read registers
+       into tab_rp_registers. So the read registers must set to 0, except the
+       first one because there is an offset of 1 register on write. */
+    rc = modbus_write_and_read_registers(ctx,
+                                         UT_REGISTERS_ADDRESS + 1, UT_REGISTERS_NB - 1,
+                                         tab_rp_registers,
+                                         UT_REGISTERS_ADDRESS,
+                                         UT_REGISTERS_NB,
+                                         tab_rp_registers);
+    printf("4/5 modbus_write_and_read_registers: ");
+    if (rc != UT_REGISTERS_NB) {
+        printf("FAILED (nb points %d != %d)\n", rc, UT_REGISTERS_NB);
+        goto close;
+    }
+
+    if (tab_rp_registers[0] != UT_REGISTERS_TAB[0]) {
+        printf("FAILED (%0X != %0X)\n",
+               tab_rp_registers[0], UT_REGISTERS_TAB[0]);
+    }
+
+    for (i=1; i < UT_REGISTERS_NB; i++) {
+        if (tab_rp_registers[i] != 0) {
+            printf("FAILED (%0X != %0X)\n",
+                   tab_rp_registers[i], 0);
+            goto close;
+        }
+    }
+    printf("OK\n");
+
+    /* End of many registers */
+
+
+    /** INPUT REGISTERS **/
+    rc = modbus_read_input_registers(ctx, UT_INPUT_REGISTERS_ADDRESS,
+                                     UT_INPUT_REGISTERS_NB,
+                                     tab_rp_registers);
+    printf("1/1 modbus_read_input_registers: ");
+    if (rc != UT_INPUT_REGISTERS_NB) {
+        printf("FAILED (nb points %d)\n", rc);
+        goto close;
+    }
+
+    for (i=0; i < UT_INPUT_REGISTERS_NB; i++) {
+        if (tab_rp_registers[i] != UT_INPUT_REGISTERS_TAB[i]) {
+            printf("FAILED (%0X != %0X)\n",
+                   tab_rp_registers[i], UT_INPUT_REGISTERS_TAB[i]);
+            goto close;
+        }
+    }
+    printf("OK\n");
+
+    printf("\nTEST FLOATS\n");
+    /** FLOAT **/
+    printf("1/2 Set float: ");
+    modbus_set_float(UT_REAL, tab_rp_registers);
+    if (tab_rp_registers[1] == (UT_IREAL >> 16) &&
+        tab_rp_registers[0] == (UT_IREAL & 0xFFFF)) {
+        printf("OK\n");
+    } else {
+        printf("FAILED (%x != %x)\n",
+               *((uint32_t *)tab_rp_registers), UT_IREAL);
+        goto close;
+    }
+
+    printf("2/2 Get float: ");
+    real = modbus_get_float(tab_rp_registers);
+    if (real == UT_REAL) {
+        printf("OK\n");
+    } else {
+        printf("FAILED (%f != %f)\n", real, UT_REAL);
+        goto close;
+    }
+
+    printf("\nAt this point, error messages doesn't mean the test has failed\n");
+
+    /** ILLEGAL DATA ADDRESS **/
+    printf("\nTEST ILLEGAL DATA ADDRESS:\n");
+
+    /* The mapping begins at 0 and ends at address + nb_points so
+     * the addresses are not valid. */
+
+    rc = modbus_read_bits(ctx, UT_BITS_ADDRESS,
+                          UT_BITS_NB + 1, tab_rp_bits);
+    printf("* modbus_read_bits: ");
+    if (rc == -1 && errno == EMBXILADD) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_read_input_bits(ctx, UT_INPUT_BITS_ADDRESS,
+                                UT_INPUT_BITS_NB + 1, tab_rp_bits);
+    printf("* modbus_read_input_bits: ");
+    if (rc == -1 && errno == EMBXILADD)
+        printf("OK\n");
+    else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_read_registers(ctx, UT_REGISTERS_ADDRESS,
+                               UT_REGISTERS_NB + 1, tab_rp_registers);
+    printf("* modbus_read_registers: ");
+    if (rc == -1 && errno == EMBXILADD)
+        printf("OK\n");
+    else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_read_input_registers(ctx, UT_INPUT_REGISTERS_ADDRESS,
+                                     UT_INPUT_REGISTERS_NB + 1,
+                                     tab_rp_registers);
+    printf("* modbus_read_input_registers: ");
+    if (rc == -1 && errno == EMBXILADD)
+        printf("OK\n");
+    else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_write_bit(ctx, UT_BITS_ADDRESS + UT_BITS_NB, ON);
+    printf("* modbus_write_bit: ");
+    if (rc == -1 && errno == EMBXILADD) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_write_bits(ctx, UT_BITS_ADDRESS + UT_BITS_NB,
+                           UT_BITS_NB, tab_rp_bits);
+    printf("* modbus_write_coils: ");
+    if (rc == -1 && errno == EMBXILADD) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_write_registers(ctx, UT_REGISTERS_ADDRESS + UT_REGISTERS_NB,
+                                UT_REGISTERS_NB, tab_rp_registers);
+    printf("* modbus_write_registers: ");
+    if (rc == -1 && errno == EMBXILADD) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+
+    /** TOO MANY DATA **/
+    printf("\nTEST TOO MANY DATA ERROR:\n");
+
+    rc = modbus_read_bits(ctx, UT_BITS_ADDRESS,
+                          MODBUS_MAX_READ_BITS + 1, tab_rp_bits);
+    printf("* modbus_read_bits: ");
+    if (rc == -1 && errno == EMBMDATA) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_read_input_bits(ctx, UT_INPUT_BITS_ADDRESS,
+                                MODBUS_MAX_READ_BITS + 1, tab_rp_bits);
+    printf("* modbus_read_input_bits: ");
+    if (rc == -1 && errno == EMBMDATA) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_read_registers(ctx, UT_REGISTERS_ADDRESS,
+                               MODBUS_MAX_READ_REGISTERS + 1,
+                               tab_rp_registers);
+    printf("* modbus_read_registers: ");
+    if (rc == -1 && errno == EMBMDATA) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_read_input_registers(ctx, UT_INPUT_REGISTERS_ADDRESS,
+                                     MODBUS_MAX_READ_REGISTERS + 1,
+                                     tab_rp_registers);
+    printf("* modbus_read_input_registers: ");
+    if (rc == -1 && errno == EMBMDATA) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    rc = modbus_write_bits(ctx, UT_BITS_ADDRESS,
+                           MODBUS_MAX_WRITE_BITS + 1, tab_rp_bits);
+    printf("* modbus_write_bits: ");
+    if (rc == -1 && errno == EMBMDATA) {
+        printf("OK\n");
+    } else {
+        goto close;
+        printf("FAILED\n");
+    }
+
+    rc = modbus_write_registers(ctx, UT_REGISTERS_ADDRESS,
+                                MODBUS_MAX_WRITE_REGISTERS + 1,
+                                tab_rp_registers);
+    printf("* modbus_write_registers: ");
+    if (rc == -1 && errno == EMBMDATA) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    /** SLAVE REPLY **/
+    printf("\nTEST SLAVE REPLY:\n");
+    modbus_set_slave(ctx, INVALID_SERVER_ID);
+    rc = modbus_read_registers(ctx, UT_REGISTERS_ADDRESS,
+                               UT_REGISTERS_NB, tab_rp_registers);
+    if (use_backend == RTU) {
+        const int RAW_REQ_LENGTH = 6;
+        uint8_t raw_req[] = { INVALID_SERVER_ID, 0x03, 0x00, 0x01, 0xFF, 0xFF };
+        uint8_t rsp[MODBUS_TCP_MAX_ADU_LENGTH];
+
+        /* No response in RTU mode */
+        printf("1/4-A No response from slave %d: ", INVALID_SERVER_ID);
+
+        if (rc == -1 && errno == ETIMEDOUT) {
+            printf("OK\n");
+        } else {
+            printf("FAILED\n");
+            goto close;
+        }
+
+        /* Send an invalid query with a wrong slave ID */
+        modbus_send_raw_request(ctx, raw_req,
+                                RAW_REQ_LENGTH * sizeof(uint8_t));
+        rc = modbus_receive_confirmation(ctx, rsp);
+
+        printf("1/4-B No response from slave %d with invalid request: ",
+               INVALID_SERVER_ID);
+
+        if (rc == -1 && errno == ETIMEDOUT) {
+            printf("OK\n");
+        } else {
+            printf("FAILED (%d)\n", rc);
+            goto close;
+        }
+
+    } else {
+        /* Response in TCP mode */
+        printf("1/4 Response from slave %d: ", 18);
+
+        if (rc == UT_REGISTERS_NB) {
+            printf("OK\n");
+        } else {
+            printf("FAILED\n");
+            goto close;
+        }
+    }
+
+    rc = modbus_set_slave(ctx, MODBUS_BROADCAST_ADDRESS);
+    if (rc == -1) {
+        printf("Invalid broacast address\n");
+        goto close;
+    }
+
+    rc = modbus_read_registers(ctx, UT_REGISTERS_ADDRESS,
+                               UT_REGISTERS_NB, tab_rp_registers);
+    printf("2/4 Reply after a broadcast query: ");
+    if (rc == UT_REGISTERS_NB) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    /* Restore slave */
+    if (use_backend == RTU) {
+        modbus_set_slave(ctx, SERVER_ID);
+    } else {
+        modbus_set_slave(ctx, MODBUS_TCP_SLAVE);
+    }
+
+    printf("3/4 Report slave ID: \n");
+    /* tab_rp_bits is used to store bytes */
+    rc = modbus_report_slave_id(ctx, tab_rp_bits);
+    if (rc == -1) {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    /* Slave ID is an arbitraty number for libmodbus */
+    if (rc > 0) {
+        printf("OK Slave ID is %d\n", tab_rp_bits[0]);
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    /* Run status indicator */
+    if (rc > 1 && tab_rp_bits[1] == 0xFF) {
+        printf("OK Run Status Indicator is %s\n", tab_rp_bits[1] ? "ON" : "OFF");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    /* Print additional data as string */
+    if (rc > 2) {
+        printf("Additional data: ");
+        for (i=2; i < rc; i++) {
+            printf("%c", tab_rp_bits[i]);
+        }
+        printf("\n");
+    }
+
+    /* Save original timeout */
+    modbus_get_response_timeout(ctx, &old_response_timeout);
+
+    /* Define a new and too short timeout */
+    response_timeout.tv_sec = 0;
+    response_timeout.tv_usec = 0;
+    modbus_set_response_timeout(ctx, &response_timeout);
+
+    rc = modbus_read_registers(ctx, UT_REGISTERS_ADDRESS,
+                               UT_REGISTERS_NB, tab_rp_registers);
+    printf("4/4 Too short timeout: ");
+    if (rc == -1 && errno == ETIMEDOUT) {
+        printf("OK\n");
+    } else {
+        printf("FAILED (can fail on slow systems or Windows)\n");
+    }
+
+    /* Restore original timeout */
+    modbus_set_response_timeout(ctx, &old_response_timeout);
+
+    /* A wait and flush operation is done by the error recovery code of
+     * libmodbus */
+
+    /** BAD RESPONSE **/
+    printf("\nTEST BAD RESPONSE ERROR:\n");
+
+    /* Allocate only the required space */
+    tab_rp_registers_bad = (uint16_t *) malloc(
+        UT_REGISTERS_NB_SPECIAL * sizeof(uint16_t));
+    rc = modbus_read_registers(ctx, UT_REGISTERS_ADDRESS,
+                               UT_REGISTERS_NB_SPECIAL, tab_rp_registers_bad);
+    printf("* modbus_read_registers: ");
+    if (rc == -1 && errno == EMBBADDATA) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    free(tab_rp_registers_bad);
+
+    /** MANUAL EXCEPTION **/
+    printf("\nTEST MANUAL EXCEPTION:\n");
+
+    rc = modbus_read_registers(ctx, UT_REGISTERS_ADDRESS_SPECIAL,
+                               UT_REGISTERS_NB, tab_rp_registers);
+    printf("* modbus_read_registers at special address: ");
+    if (rc == -1 && errno == EMBXSBUSY) {
+        printf("OK\n");
+    } else {
+        printf("FAILED\n");
+        goto close;
+    }
+
+    /** RAW REQUEST */
+    printf("\nTEST RAW REQUEST:\n");
+    {
+        const int RAW_REQ_LENGTH = 6;
+        uint8_t raw_req[] = { (use_backend == RTU) ? SERVER_ID : 0xFF,
+                              0x03, 0x00, 0x01, 0x0, 0x05 };
+        int req_length;
+        uint8_t rsp[MODBUS_TCP_MAX_ADU_LENGTH];
+
+        req_length = modbus_send_raw_request(ctx, raw_req,
+                                             RAW_REQ_LENGTH * sizeof(uint8_t));
+
+        printf("* modbus_send_raw_request: ");
+        if ((use_backend == RTU && req_length == (RAW_REQ_LENGTH + 2)) ||
+            ((use_backend == TCP || use_backend == TCP_PI) &&
+             req_length == (RAW_REQ_LENGTH + 6))) {
+            printf("OK\n");
+        } else {
+            printf("FAILED (%d)\n", req_length);
+            goto close;
+        }
+
+        printf("* modbus_receive_confirmation: ");
+        rc  = modbus_receive_confirmation(ctx, rsp);
+        if ((use_backend == RTU && rc == 15) ||
+            ((use_backend == TCP || use_backend == TCP_PI) &&
+             rc == 19)) {
+            printf("OK\n");
+        } else {
+            printf("FAILED (%d)\n", rc);
+            goto close;
+        }
+    }
+
+    printf("\nALL TESTS PASS WITH SUCCESS.\n");
+
+close:
+    /* Free the memory */
+    free(tab_rp_bits);
+    free(tab_rp_registers);
+
+    /* Close the connection */
+    modbus_close(ctx);
+    modbus_free(ctx);
+
+    return 0;
+}
diff --git a/tests/unit-test-client.o b/tests/unit-test-client.o
new file mode 100644
index 0000000..8358604
--- /dev/null
+++ b/tests/unit-test-client.o