2 * collectd - src/modbus.c
3 * Copyright (C) 2010,2011 noris network AG
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU Lesser General Public License as published by
7 * the Free Software Foundation; only version 2.1 of the License is
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Florian Forster <octo at noris.net>
26 #include "configfile.h"
31 #include <sys/socket.h>
33 #ifndef LIBMODBUS_VERSION_CHECK
34 /* Assume version 2.0.3 */
35 #define LEGACY_LIBMODBUS 1
37 /* Assume version 2.9.2 */
40 #ifndef MODBUS_TCP_DEFAULT_PORT
41 #ifdef MODBUS_TCP_PORT
42 #define MODBUS_TCP_DEFAULT_PORT MODBUS_TCP_PORT
44 #define MODBUS_TCP_DEFAULT_PORT 502
51 * RegisterCmd ReadHolding
61 * # Device "/dev/ttyUSB0"
67 * Instance "foobar" # optional
76 enum mb_register_type_e /* {{{ */
86 REG_TYPE_FLOAT_CDAB }; /* }}} */
88 enum mb_mreg_type_e /* {{{ */
90 MREG_INPUT }; /* }}} */
91 typedef enum mb_register_type_e mb_register_type_t;
92 typedef enum mb_mreg_type_e mb_mreg_type_t;
94 /* TCP or RTU depending on what is specified in host config block */
95 enum mb_conntype_e /* {{{ */
97 MBCONN_RTU }; /* }}} */
98 typedef enum mb_conntype_e mb_conntype_t;
101 typedef struct mb_data_s mb_data_t;
102 struct mb_data_s /* {{{ */
106 mb_register_type_t register_type;
107 mb_mreg_type_t modbus_register_type;
108 char type[DATA_MAX_NAME_LEN];
109 char instance[DATA_MAX_NAME_LEN];
114 struct mb_slave_s /* {{{ */
117 char instance[DATA_MAX_NAME_LEN];
120 typedef struct mb_slave_s mb_slave_t;
122 struct mb_host_s /* {{{ */
124 char host[DATA_MAX_NAME_LEN];
125 char node[NI_MAXHOST]; /* TCP hostname or RTU serial device */
126 /* char service[NI_MAXSERV]; */
127 int port; /* for Modbus/TCP */
128 int baudrate; /* for Modbus/RTU */
129 mb_conntype_t conntype;
136 modbus_param_t connection;
138 modbus_t *connection;
142 typedef struct mb_host_s mb_host_t;
144 struct mb_data_group_s;
145 typedef struct mb_data_group_s mb_data_group_t;
146 struct mb_data_group_s /* {{{ */
148 mb_data_t *registers;
149 size_t registers_num;
151 mb_data_group_t *next;
157 static mb_data_t *data_definitions;
162 static mb_data_t *data_get_by_name(mb_data_t *src, /* {{{ */
167 for (mb_data_t *ptr = src; ptr != NULL; ptr = ptr->next)
168 if (strcasecmp(ptr->name, name) == 0)
172 } /* }}} mb_data_t *data_get_by_name */
174 static int data_append(mb_data_t **dst, mb_data_t *src) /* {{{ */
178 if ((dst == NULL) || (src == NULL))
188 while (ptr->next != NULL)
194 } /* }}} int data_append */
196 /* Copy a single mb_data_t and append it to another list. */
197 static int data_copy(mb_data_t **dst, const mb_data_t *src) /* {{{ */
202 if ((dst == NULL) || (src == NULL))
205 tmp = malloc(sizeof(*tmp));
208 memcpy(tmp, src, sizeof(*tmp));
212 tmp->name = strdup(src->name);
213 if (tmp->name == NULL) {
218 status = data_append(dst, tmp);
226 } /* }}} int data_copy */
228 /* Lookup a single mb_data_t instance, copy it and append the copy to another
230 static int data_copy_by_name(mb_data_t **dst, mb_data_t *src, /* {{{ */
234 if ((dst == NULL) || (src == NULL) || (name == NULL))
237 ptr = data_get_by_name(src, name);
241 return data_copy(dst, ptr);
242 } /* }}} int data_copy_by_name */
246 static int mb_submit(mb_host_t *host, mb_slave_t *slave, /* {{{ */
247 mb_data_t *data, value_t value) {
248 value_list_t vl = VALUE_LIST_INIT;
250 if ((host == NULL) || (slave == NULL) || (data == NULL))
253 if (host->interval == 0)
254 host->interval = plugin_get_interval();
256 if (slave->instance[0] == 0)
257 snprintf(slave->instance, sizeof(slave->instance), "slave_%i", slave->id);
261 vl.interval = host->interval;
262 sstrncpy(vl.host, host->host, sizeof(vl.host));
263 sstrncpy(vl.plugin, "modbus", sizeof(vl.plugin));
264 sstrncpy(vl.plugin_instance, slave->instance, sizeof(vl.plugin_instance));
265 sstrncpy(vl.type, data->type, sizeof(vl.type));
266 sstrncpy(vl.type_instance, data->instance, sizeof(vl.type_instance));
268 return plugin_dispatch_values(&vl);
269 } /* }}} int mb_submit */
271 static float mb_register_to_float(uint16_t hi, uint16_t lo) /* {{{ */
279 #if BYTE_ORDER == LITTLE_ENDIAN
281 conv.b[0] = lo & 0x00ff;
282 conv.b[1] = (lo >> 8) & 0x00ff;
283 conv.b[2] = hi & 0x00ff;
284 conv.b[3] = (hi >> 8) & 0x00ff;
286 conv.b[3] = lo & 0x00ff;
287 conv.b[2] = (lo >> 8) & 0x00ff;
288 conv.b[1] = hi & 0x00ff;
289 conv.b[0] = (hi >> 8) & 0x00ff;
293 } /* }}} float mb_register_to_float */
297 static int mb_init_connection(mb_host_t *host) /* {{{ */
305 modbus_set_debug(&host->connection, 1);
308 /* We'll do the error handling ourselves. */
309 modbus_set_error_handling(&host->connection, NOP_ON_ERROR);
311 if (host->conntype == MBCONN_TCP) {
312 if ((host->port < 1) || (host->port > 65535))
313 host->port = MODBUS_TCP_DEFAULT_PORT;
315 DEBUG("Modbus plugin: Trying to connect to \"%s\", port %i.", host->node,
318 modbus_init_tcp(&host->connection,
319 /* host = */ host->node,
320 /* port = */ host->port);
321 } else /* MBCONN_RTU */
323 DEBUG("Modbus plugin: Trying to connect to \"%s\".", host->node);
325 modbus_init_rtu(&host->connection,
326 /* device = */ host->node,
327 /* baudrate = */ host->baudrate, 'N', 8, 1, 0);
330 status = modbus_connect(&host->connection);
332 ERROR("Modbus plugin: modbus_connect (%s, %i) failed with status %i.",
333 host->node, host->port ? host->port : host->baudrate, status);
337 host->is_connected = true;
339 } /* }}} int mb_init_connection */
340 /* #endif LEGACY_LIBMODBUS */
342 #else /* if !LEGACY_LIBMODBUS */
344 static int mb_init_connection(mb_host_t *host) /* {{{ */
351 if (host->connection != NULL)
354 if (host->conntype == MBCONN_TCP) {
355 if ((host->port < 1) || (host->port > 65535))
356 host->port = MODBUS_TCP_DEFAULT_PORT;
358 DEBUG("Modbus plugin: Trying to connect to \"%s\", port %i.", host->node,
361 host->connection = modbus_new_tcp(host->node, host->port);
362 if (host->connection == NULL) {
363 ERROR("Modbus plugin: Creating new Modbus/TCP object failed.");
367 DEBUG("Modbus plugin: Trying to connect to \"%s\", baudrate %i.",
368 host->node, host->baudrate);
370 host->connection = modbus_new_rtu(host->node, host->baudrate, 'N', 8, 1);
371 if (host->connection == NULL) {
372 ERROR("Modbus plugin: Creating new Modbus/RTU object failed.");
378 modbus_set_debug(host->connection, 1);
381 /* We'll do the error handling ourselves. */
382 modbus_set_error_recovery(host->connection, 0);
384 status = modbus_connect(host->connection);
386 ERROR("Modbus plugin: modbus_connect (%s, %i) failed with status %i.",
387 host->node, host->port ? host->port : host->baudrate, status);
388 modbus_free(host->connection);
389 host->connection = NULL;
394 } /* }}} int mb_init_connection */
395 #endif /* !LEGACY_LIBMODBUS */
397 #define CAST_TO_VALUE_T(ds, vt, raw) \
399 if ((ds)->ds[0].type == DS_TYPE_COUNTER) \
400 (vt).counter = (counter_t)(raw); \
401 else if ((ds)->ds[0].type == DS_TYPE_GAUGE) \
402 (vt).gauge = (gauge_t)(raw); \
403 else if ((ds)->ds[0].type == DS_TYPE_DERIVE) \
404 (vt).derive = (derive_t)(raw); \
405 else /* if (ds->ds[0].type == DS_TYPE_ABSOLUTE) */ \
406 (vt).absolute = (absolute_t)(raw); \
409 static int mb_read_data(mb_host_t *host, mb_slave_t *slave, /* {{{ */
411 uint16_t values[4] = {0};
413 const data_set_t *ds;
416 if ((host == NULL) || (slave == NULL) || (data == NULL))
419 ds = plugin_get_ds(data->type);
421 ERROR("Modbus plugin: Type \"%s\" is not defined.", data->type);
425 if (ds->ds_num != 1) {
426 ERROR("Modbus plugin: The type \"%s\" has %" PRIsz " data sources. "
427 "I can only handle data sets with only one data source.",
428 data->type, ds->ds_num);
432 if ((ds->ds[0].type != DS_TYPE_GAUGE) &&
433 (data->register_type != REG_TYPE_INT32) &&
434 (data->register_type != REG_TYPE_INT32_CDAB) &&
435 (data->register_type != REG_TYPE_UINT32) &&
436 (data->register_type != REG_TYPE_INT64) &&
437 (data->register_type != REG_TYPE_UINT64) &&
438 (data->register_type != REG_TYPE_UINT32_CDAB)) {
440 "Modbus plugin: The data source of type \"%s\" is %s, not gauge. "
441 "This will most likely result in problems, because the register type "
442 "is not UINT32 OR UINT64.",
443 data->type, DS_TYPE_TO_STRING(ds->ds[0].type));
446 if ((data->register_type == REG_TYPE_INT32) ||
447 (data->register_type == REG_TYPE_INT32_CDAB) ||
448 (data->register_type == REG_TYPE_UINT32) ||
449 (data->register_type == REG_TYPE_UINT32_CDAB) ||
450 (data->register_type == REG_TYPE_FLOAT) ||
451 (data->register_type == REG_TYPE_FLOAT_CDAB))
453 else if ((data->register_type == REG_TYPE_UINT64) ||
454 (data->register_type == REG_TYPE_INT64))
459 if (host->connection == NULL) {
461 } else if (host->conntype == MBCONN_TCP) {
462 /* getpeername() is used only to determine if the socket is connected, not
463 * because we're really interested in the peer's IP address. */
464 if (getpeername(modbus_get_socket(host->connection),
465 (void *)&(struct sockaddr_storage){0},
466 &(socklen_t){sizeof(struct sockaddr_storage)}) != 0)
470 if ((status == EBADF) || (status == ENOTSOCK) || (status == ENOTCONN)) {
471 status = mb_init_connection(host);
473 ERROR("Modbus plugin: mb_init_connection (%s/%s) failed. ", host->host,
475 host->is_connected = false;
476 host->connection = NULL;
479 } else if (status != 0) {
481 modbus_close(&host->connection);
483 modbus_close(host->connection);
484 modbus_free(host->connection);
489 /* Version 2.0.3: Pass the connection struct as a pointer and pass the slave
490 * id to each call of "read_holding_registers". */
491 #define modbus_read_registers(ctx, addr, nb, dest) \
492 read_holding_registers(&(ctx), slave->id, (addr), (nb), (dest))
493 #else /* if !LEGACY_LIBMODBUS */
494 /* Version 2.9.2: Set the slave id once before querying the registers. */
495 status = modbus_set_slave(host->connection, slave->id);
497 ERROR("Modbus plugin: modbus_set_slave (%i) failed with status %i.",
502 if (data->modbus_register_type == MREG_INPUT) {
503 status = modbus_read_input_registers(host->connection,
504 /* start_addr = */ data->register_base,
505 /* num_registers = */ values_num,
506 /* buffer = */ values);
508 status = modbus_read_registers(host->connection,
509 /* start_addr = */ data->register_base,
510 /* num_registers = */ values_num,
511 /* buffer = */ values);
513 if (status != values_num) {
514 ERROR("Modbus plugin: modbus read function (%s/%s) failed. "
515 " status = %i, start_addr = %i, values_num = %i. Giving up.",
516 host->host, host->node, status, data->register_base, values_num);
518 modbus_close(&host->connection);
520 modbus_close(host->connection);
521 modbus_free(host->connection);
523 host->connection = NULL;
527 DEBUG("Modbus plugin: mb_read_data: Success! "
528 "modbus_read_registers returned with status %i.",
531 if (data->register_type == REG_TYPE_FLOAT) {
535 float_value = mb_register_to_float(values[0], values[1]);
536 DEBUG("Modbus plugin: mb_read_data: "
537 "Returned float value is %g",
538 (double)float_value);
540 CAST_TO_VALUE_T(ds, vt, float_value);
541 mb_submit(host, slave, data, vt);
542 } else if (data->register_type == REG_TYPE_FLOAT_CDAB) {
546 float_value = mb_register_to_float(values[1], values[0]);
547 DEBUG("Modbus plugin: mb_read_data: "
548 "Returned float value is %g",
549 (double)float_value);
551 CAST_TO_VALUE_T(ds, vt, float_value);
552 mb_submit(host, slave, data, vt);
553 } else if (data->register_type == REG_TYPE_INT32) {
560 v.u32 = (((uint32_t)values[0]) << 16) | ((uint32_t)values[1]);
561 DEBUG("Modbus plugin: mb_read_data: "
562 "Returned int32 value is %" PRIi32,
565 CAST_TO_VALUE_T(ds, vt, v.i32);
566 mb_submit(host, slave, data, vt);
567 } else if (data->register_type == REG_TYPE_INT32_CDAB) {
574 v.u32 = (((uint32_t)values[1]) << 16) | ((uint32_t)values[0]);
575 DEBUG("Modbus plugin: mb_read_data: "
576 "Returned int32 value is %" PRIi32,
579 CAST_TO_VALUE_T(ds, vt, v.i32);
580 mb_submit(host, slave, data, vt);
581 } else if (data->register_type == REG_TYPE_INT16) {
590 DEBUG("Modbus plugin: mb_read_data: "
591 "Returned int16 value is %" PRIi16,
594 CAST_TO_VALUE_T(ds, vt, v.i16);
595 mb_submit(host, slave, data, vt);
596 } else if (data->register_type == REG_TYPE_UINT32) {
600 v32 = (((uint32_t)values[0]) << 16) | ((uint32_t)values[1]);
601 DEBUG("Modbus plugin: mb_read_data: "
602 "Returned uint32 value is %" PRIu32,
605 CAST_TO_VALUE_T(ds, vt, v32);
606 mb_submit(host, slave, data, vt);
607 } else if (data->register_type == REG_TYPE_UINT32_CDAB) {
611 v32 = (((uint32_t)values[1]) << 16) | ((uint32_t)values[0]);
612 DEBUG("Modbus plugin: mb_read_data: "
613 "Returned uint32 value is %" PRIu32,
616 CAST_TO_VALUE_T(ds, vt, v32);
617 mb_submit(host, slave, data, vt);
618 } else if (data->register_type == REG_TYPE_UINT64) {
622 v64 = (((uint64_t)values[0]) << 48) | (((uint64_t)values[1]) << 32) |
623 (((uint64_t)values[2]) << 16) | (((uint64_t)values[3]));
624 DEBUG("Modbus plugin: mb_read_data: "
625 "Returned uint64 value is %" PRIu64,
628 CAST_TO_VALUE_T(ds, vt, v64);
629 mb_submit(host, slave, data, vt);
630 } else if (data->register_type == REG_TYPE_INT64) {
637 v.u64 = (((uint64_t)values[0]) << 48) | (((uint64_t)values[1]) << 32) |
638 (((uint64_t)values[2]) << 16) | ((uint64_t)values[3]);
639 DEBUG("Modbus plugin: mb_read_data: "
640 "Returned uint64 value is %" PRIi64,
643 CAST_TO_VALUE_T(ds, vt, v.i64);
644 mb_submit(host, slave, data, vt);
645 } else /* if (data->register_type == REG_TYPE_UINT16) */
649 DEBUG("Modbus plugin: mb_read_data: "
650 "Returned uint16 value is %" PRIu16,
653 CAST_TO_VALUE_T(ds, vt, values[0]);
654 mb_submit(host, slave, data, vt);
658 } /* }}} int mb_read_data */
660 static int mb_read_slave(mb_host_t *host, mb_slave_t *slave) /* {{{ */
665 if ((host == NULL) || (slave == NULL))
669 for (mb_data_t *data = slave->collect; data != NULL; data = data->next) {
670 status = mb_read_data(host, slave, data);
679 } /* }}} int mb_read_slave */
681 static int mb_read(user_data_t *user_data) /* {{{ */
687 if ((user_data == NULL) || (user_data->data == NULL))
690 host = user_data->data;
693 for (size_t i = 0; i < host->slaves_num; i++) {
694 status = mb_read_slave(host, host->slaves + i);
703 } /* }}} int mb_read */
707 static void data_free_one(mb_data_t *data) /* {{{ */
714 } /* }}} void data_free_one */
716 static void data_free_all(mb_data_t *data) /* {{{ */
727 } /* }}} void data_free_all */
729 static void slaves_free_all(mb_slave_t *slaves, size_t slaves_num) /* {{{ */
734 for (size_t i = 0; i < slaves_num; i++)
735 data_free_all(slaves[i].collect);
737 } /* }}} void slaves_free_all */
739 static void host_free(void *void_host) /* {{{ */
741 mb_host_t *host = void_host;
746 slaves_free_all(host->slaves, host->slaves_num);
748 } /* }}} void host_free */
750 /* Config functions */
752 static int mb_config_add_data(oconfig_item_t *ci) /* {{{ */
754 mb_data_t data = {0};
758 data.register_type = REG_TYPE_UINT16;
761 status = cf_util_get_string(ci, &data.name);
765 for (int i = 0; i < ci->children_num; i++) {
766 oconfig_item_t *child = ci->children + i;
768 if (strcasecmp("Type", child->key) == 0)
769 status = cf_util_get_string_buffer(child, data.type, sizeof(data.type));
770 else if (strcasecmp("Instance", child->key) == 0)
771 status = cf_util_get_string_buffer(child, data.instance,
772 sizeof(data.instance));
773 else if (strcasecmp("RegisterBase", child->key) == 0)
774 status = cf_util_get_int(child, &data.register_base);
775 else if (strcasecmp("RegisterType", child->key) == 0) {
777 status = cf_util_get_string_buffer(child, tmp, sizeof(tmp));
780 else if (strcasecmp("Int16", tmp) == 0)
781 data.register_type = REG_TYPE_INT16;
782 else if (strcasecmp("Int32", tmp) == 0)
783 data.register_type = REG_TYPE_INT32;
784 else if (strcasecmp("Int32LE", tmp) == 0)
785 data.register_type = REG_TYPE_INT32_CDAB;
786 else if (strcasecmp("Uint16", tmp) == 0)
787 data.register_type = REG_TYPE_UINT16;
788 else if (strcasecmp("Uint32", tmp) == 0)
789 data.register_type = REG_TYPE_UINT32;
790 else if (strcasecmp("Uint32LE", tmp) == 0)
791 data.register_type = REG_TYPE_UINT32_CDAB;
792 else if (strcasecmp("Float", tmp) == 0)
793 data.register_type = REG_TYPE_FLOAT;
794 else if (strcasecmp("FloatLE", tmp) == 0)
795 data.register_type = REG_TYPE_FLOAT_CDAB;
796 else if (strcasecmp("Uint64", tmp) == 0)
797 data.register_type = REG_TYPE_UINT64;
798 else if (strcasecmp("Int64", tmp) == 0)
799 data.register_type = REG_TYPE_INT64;
801 ERROR("Modbus plugin: The register type \"%s\" is unknown.", tmp);
804 } else if (strcasecmp("RegisterCmd", child->key) == 0) {
806 ERROR("Modbus plugin: RegisterCmd parameter can not be used "
807 "with your libmodbus version");
810 status = cf_util_get_string_buffer(child, tmp, sizeof(tmp));
813 else if (strcasecmp("ReadHolding", tmp) == 0)
814 data.modbus_register_type = MREG_HOLDING;
815 else if (strcasecmp("ReadInput", tmp) == 0)
816 data.modbus_register_type = MREG_INPUT;
818 ERROR("Modbus plugin: The modbus_register_type \"%s\" is unknown.",
824 ERROR("Modbus plugin: Unknown configuration option: %s", child->key);
830 } /* for (i = 0; i < ci->children_num; i++) */
832 assert(data.name != NULL);
833 if (data.type[0] == 0) {
834 ERROR("Modbus plugin: Data block \"%s\": No type has been specified.",
840 data_copy(&data_definitions, &data);
845 } /* }}} int mb_config_add_data */
847 static int mb_config_set_host_address(mb_host_t *host, /* {{{ */
848 const char *address) {
849 struct addrinfo *ai_list;
852 if ((host == NULL) || (address == NULL))
855 struct addrinfo ai_hints = {
856 /* XXX: libmodbus can only handle IPv4 addresses. */
857 .ai_family = AF_INET,
858 .ai_flags = AI_ADDRCONFIG};
860 status = getaddrinfo(address, /* service = */ NULL, &ai_hints, &ai_list);
862 ERROR("Modbus plugin: getaddrinfo failed: %s",
863 (status == EAI_SYSTEM) ? STRERRNO : gai_strerror(status));
867 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL;
868 ai_ptr = ai_ptr->ai_next) {
869 status = getnameinfo(ai_ptr->ai_addr, ai_ptr->ai_addrlen, host->node,
871 /* service = */ NULL, /* length = */ 0,
872 /* flags = */ NI_NUMERICHOST);
877 freeaddrinfo(ai_list);
880 ERROR("Modbus plugin: Unable to translate node name: \"%s\"", address);
881 else /* if (status == 0) */
883 DEBUG("Modbus plugin: mb_config_set_host_address: %s -> %s", address,
888 } /* }}} int mb_config_set_host_address */
890 static int mb_config_add_slave(mb_host_t *host, oconfig_item_t *ci) /* {{{ */
895 if ((host == NULL) || (ci == NULL))
898 slave = realloc(host->slaves, sizeof(*slave) * (host->slaves_num + 1));
901 host->slaves = slave;
902 slave = host->slaves + host->slaves_num;
903 memset(slave, 0, sizeof(*slave));
904 slave->collect = NULL;
906 status = cf_util_get_int(ci, &slave->id);
910 for (int i = 0; i < ci->children_num; i++) {
911 oconfig_item_t *child = ci->children + i;
913 if (strcasecmp("Instance", child->key) == 0)
914 status = cf_util_get_string_buffer(child, slave->instance,
915 sizeof(slave->instance));
916 else if (strcasecmp("Collect", child->key) == 0) {
918 status = cf_util_get_string_buffer(child, buffer, sizeof(buffer));
920 data_copy_by_name(&slave->collect, data_definitions, buffer);
921 status = 0; /* continue after failure. */
923 ERROR("Modbus plugin: Unknown configuration option: %s", child->key);
931 if ((status == 0) && (slave->collect == NULL))
939 else /* if (status != 0) */
940 data_free_all(slave->collect);
943 } /* }}} int mb_config_add_slave */
945 static int mb_config_add_host(oconfig_item_t *ci) /* {{{ */
950 host = calloc(1, sizeof(*host));
955 status = cf_util_get_string_buffer(ci, host->host, sizeof(host->host));
960 if (host->host[0] == 0) {
965 for (int i = 0; i < ci->children_num; i++) {
966 oconfig_item_t *child = ci->children + i;
969 if (strcasecmp("Address", child->key) == 0) {
970 char buffer[NI_MAXHOST];
971 status = cf_util_get_string_buffer(child, buffer, sizeof(buffer));
973 status = mb_config_set_host_address(host, buffer);
975 host->conntype = MBCONN_TCP;
976 } else if (strcasecmp("Port", child->key) == 0) {
977 host->port = cf_util_get_port_number(child);
980 } else if (strcasecmp("Device", child->key) == 0) {
981 status = cf_util_get_string_buffer(child, host->node, sizeof(host->node));
983 host->conntype = MBCONN_RTU;
984 } else if (strcasecmp("Baudrate", child->key) == 0)
985 status = cf_util_get_int(child, &host->baudrate);
986 else if (strcasecmp("Interval", child->key) == 0)
987 status = cf_util_get_cdtime(child, &host->interval);
988 else if (strcasecmp("Slave", child->key) == 0)
989 /* Don't set status: Gracefully continue if a slave fails. */
990 mb_config_add_slave(host, child);
992 ERROR("Modbus plugin: Unknown configuration option: %s", child->key);
998 } /* for (i = 0; i < ci->children_num; i++) */
1000 assert(host->host[0] != 0);
1001 if (host->node[0] == 0) {
1002 ERROR("Modbus plugin: Data block \"%s\": No address or device has been "
1007 if (host->conntype == MBCONN_RTU && !host->baudrate) {
1008 ERROR("Modbus plugin: Data block \"%s\": No serial baudrate has been "
1013 if ((host->conntype == MBCONN_TCP && host->baudrate) ||
1014 (host->conntype == MBCONN_RTU && host->port)) {
1015 ERROR("Modbus plugin: Data block \"%s\": You've mixed up RTU and TCP "
1024 snprintf(name, sizeof(name), "modbus-%s", host->host);
1026 plugin_register_complex_read(/* group = */ NULL, name,
1027 /* callback = */ mb_read,
1028 /* interval = */ host->interval,
1030 .data = host, .free_func = host_free,
1037 } /* }}} int mb_config_add_host */
1039 static int mb_config(oconfig_item_t *ci) /* {{{ */
1044 for (int i = 0; i < ci->children_num; i++) {
1045 oconfig_item_t *child = ci->children + i;
1047 if (strcasecmp("Data", child->key) == 0)
1048 mb_config_add_data(child);
1049 else if (strcasecmp("Host", child->key) == 0)
1050 mb_config_add_host(child);
1052 ERROR("Modbus plugin: Unknown configuration option: %s", child->key);
1056 } /* }}} int mb_config */
1060 static int mb_shutdown(void) /* {{{ */
1062 data_free_all(data_definitions);
1063 data_definitions = NULL;
1066 } /* }}} int mb_shutdown */
1068 void module_register(void) {
1069 plugin_register_complex_config("modbus", mb_config);
1070 plugin_register_shutdown("modbus", mb_shutdown);
1071 } /* void module_register */