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-rw-r--r--tests/unit-test-server.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/tests/unit-test-server.c b/tests/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"
+
+enum {
+ TCP,
+ TCP_PI,
+ RTU
+};
+
+int main(int argc, char*argv[])
+{
+ int socket;
+ modbus_t *ctx;
+ modbus_mapping_t *mb_mapping;
+ int rc;
+ int i;
+ int use_backend;
+ uint8_t *query;
+ int header_length;
+
+ 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 server for unit testing\n\n", argv[0]);
+ return -1;
+ }
+ } else {
+ /* By default */
+ use_backend = TCP;
+ }
+
+ if (use_backend == TCP) {
+ ctx = modbus_new_tcp("127.0.0.1", 1502);
+ query = malloc(MODBUS_TCP_MAX_ADU_LENGTH);
+ } else if (use_backend == TCP_PI) {
+ ctx = modbus_new_tcp_pi("::0", "1502");
+ query = malloc(MODBUS_TCP_MAX_ADU_LENGTH);
+ } else {
+ ctx = modbus_new_rtu("/dev/ttyUSB0", 115200, 'N', 8, 1);
+ modbus_set_slave(ctx, SERVER_ID);
+ query = malloc(MODBUS_RTU_MAX_ADU_LENGTH);
+ }
+ header_length = modbus_get_header_length(ctx);
+
+ modbus_set_debug(ctx, TRUE);
+
+ mb_mapping = modbus_mapping_new(
+ UT_BITS_ADDRESS + UT_BITS_NB,
+ UT_INPUT_BITS_ADDRESS + UT_INPUT_BITS_NB,
+ UT_REGISTERS_ADDRESS + UT_REGISTERS_NB,
+ UT_INPUT_REGISTERS_ADDRESS + UT_INPUT_REGISTERS_NB);
+ 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,
+ UT_INPUT_BITS_TAB);
+
+ /** INPUT REGISTERS **/
+ for (i=0; i < UT_INPUT_REGISTERS_NB; i++) {
+ mb_mapping->tab_input_registers[UT_INPUT_REGISTERS_ADDRESS+i] =
+ UT_INPUT_REGISTERS_TAB[i];;
+ }
+
+ if (use_backend == TCP) {
+ socket = modbus_tcp_listen(ctx, 1);
+ modbus_tcp_accept(ctx, &socket);
+ } else if (use_backend == TCP_PI) {
+ socket = modbus_tcp_pi_listen(ctx, 1);
+ modbus_tcp_pi_accept(ctx, &socket);
+ } else {
+ rc = modbus_connect(ctx);
+ if (rc == -1) {
+ fprintf(stderr, "Unable to connect %s\n", modbus_strerror(errno));
+ modbus_free(ctx);
+ return -1;
+ }
+ }
+
+ for (;;) {
+ rc = modbus_receive(ctx, query);
+ if (rc == -1) {
+ /* Connection closed by the client or error */
+ break;
+ }
+
+ /* Read holding registers */
+ if (query[header_length] == 0x03) {
+ if (MODBUS_GET_INT16_FROM_INT8(query, header_length + 3)
+ == UT_REGISTERS_NB_SPECIAL) {
+ printf("Set an incorrect number of values\n");
+ MODBUS_SET_INT16_TO_INT8(query, header_length + 3,
+ UT_REGISTERS_NB_SPECIAL - 1);
+ } else if (MODBUS_GET_INT16_FROM_INT8(query, header_length + 1)
+ == UT_REGISTERS_ADDRESS_SPECIAL) {
+ printf("Reply to this special register address by an exception\n");
+ modbus_reply_exception(ctx, query,
+ MODBUS_EXCEPTION_SLAVE_OR_SERVER_BUSY);
+ continue;
+ }
+ }
+
+ rc = modbus_reply(ctx, query, rc, mb_mapping);
+ if (rc == -1) {
+ break;
+ }
+ }
+
+ printf("Quit the loop: %s\n", modbus_strerror(errno));
+
+ if (use_backend == TCP) {
+ close(socket);
+ }
+ modbus_mapping_free(mb_mapping);
+ free(query);
+ modbus_free(ctx);
+
+ return 0;
+}