unit-test-server.c
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/*
* 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"
/* Copied from modbus-private.h */
#define HEADER_LENGTH_TCP 7
int main(void)
{
int socket;
modbus_t *ctx;
modbus_mapping_t *mb_mapping;
int rc;
int i;
ctx = modbus_new_tcp("127.0.0.1", 1502);
modbus_set_debug(ctx, TRUE);
modbus_set_error_recovery(ctx, TRUE);
mb_mapping = modbus_mapping_new(
UT_BITS_ADDRESS + UT_BITS_NB_POINTS,
UT_INPUT_BITS_ADDRESS + UT_INPUT_BITS_NB_POINTS,
UT_REGISTERS_ADDRESS + UT_REGISTERS_NB_POINTS,
UT_INPUT_REGISTERS_ADDRESS + UT_INPUT_REGISTERS_NB_POINTS);
if (mb_mapping == NULL) {
fprintf(stderr, "Failed to allocate the mapping: %s\n",
modbus_strerror(errno));
modbus_free(ctx);
return -1;
}
/* Examples from PI_MODBUS_300.pdf.
Only the read-only input values are assigned. */
/** INPUT STATUS **/
modbus_set_bits_from_bytes(mb_mapping->tab_input_bits,
UT_INPUT_BITS_ADDRESS, UT_INPUT_BITS_NB_POINTS,
UT_INPUT_BITS_TAB);
/** INPUT REGISTERS **/
for (i=0; i < UT_INPUT_REGISTERS_NB_POINTS; i++) {
mb_mapping->tab_input_registers[UT_INPUT_REGISTERS_ADDRESS+i] =
UT_INPUT_REGISTERS_TAB[i];;
}
socket = modbus_listen(ctx, 1);
modbus_accept(ctx, &socket);
for (;;) {
uint8_t query[MODBUS_MAX_ADU_LENGTH_TCP];
rc = modbus_receive(ctx, -1, query);
if (rc > 0) {
if (((query[HEADER_LENGTH_TCP + 3] << 8) +
query[HEADER_LENGTH_TCP + 4])
== UT_REGISTERS_NB_POINTS_SPECIAL) {
/* Change the number of values (offset
TCP = 6) */
query[HEADER_LENGTH_TCP + 3] = 0;
query[HEADER_LENGTH_TCP + 4] = UT_REGISTERS_NB_POINTS;
}
rc = modbus_reply(ctx, query, rc, mb_mapping);
if (rc == -1) {
return -1;
}
} else {
/* Connection closed by the client or error */
break;
}
}
printf("Quit the loop: %s\n", modbus_strerror(errno));
close(socket);
modbus_mapping_free(mb_mapping);
modbus_free(ctx);
return 0;
}