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 /* {{{ */
84 REG_TYPE_FLOAT_CDAB }; /* }}} */
86 enum mb_mreg_type_e /* {{{ */
88 MREG_INPUT }; /* }}} */
89 typedef enum mb_register_type_e mb_register_type_t;
90 typedef enum mb_mreg_type_e mb_mreg_type_t;
92 /* TCP or RTU depending on what is specified in host config block */
93 enum mb_conntype_e /* {{{ */
95 MBCONN_RTU }; /* }}} */
96 typedef enum mb_conntype_e mb_conntype_t;
99 typedef struct mb_data_s mb_data_t;
100 struct mb_data_s /* {{{ */
104 mb_register_type_t register_type;
105 mb_mreg_type_t modbus_register_type;
106 char type[DATA_MAX_NAME_LEN];
107 char instance[DATA_MAX_NAME_LEN];
112 struct mb_slave_s /* {{{ */
115 char instance[DATA_MAX_NAME_LEN];
118 typedef struct mb_slave_s mb_slave_t;
120 struct mb_host_s /* {{{ */
122 char host[DATA_MAX_NAME_LEN];
123 char node[NI_MAXHOST]; /* TCP hostname or RTU serial device */
124 /* char service[NI_MAXSERV]; */
125 int port; /* for Modbus/TCP */
126 int baudrate; /* for Modbus/RTU */
127 mb_conntype_t conntype;
134 modbus_param_t connection;
136 modbus_t *connection;
140 typedef struct mb_host_s mb_host_t;
142 struct mb_data_group_s;
143 typedef struct mb_data_group_s mb_data_group_t;
144 struct mb_data_group_s /* {{{ */
146 mb_data_t *registers;
147 size_t registers_num;
149 mb_data_group_t *next;
155 static mb_data_t *data_definitions = NULL;
160 static mb_data_t *data_get_by_name(mb_data_t *src, /* {{{ */
165 for (mb_data_t *ptr = src; ptr != NULL; ptr = ptr->next)
166 if (strcasecmp(ptr->name, name) == 0)
170 } /* }}} mb_data_t *data_get_by_name */
172 static int data_append(mb_data_t **dst, mb_data_t *src) /* {{{ */
176 if ((dst == NULL) || (src == NULL))
186 while (ptr->next != NULL)
192 } /* }}} int data_append */
194 /* Copy a single mb_data_t and append it to another list. */
195 static int data_copy(mb_data_t **dst, const mb_data_t *src) /* {{{ */
200 if ((dst == NULL) || (src == NULL))
203 tmp = malloc(sizeof(*tmp));
206 memcpy(tmp, src, sizeof(*tmp));
210 tmp->name = strdup(src->name);
211 if (tmp->name == NULL) {
216 status = data_append(dst, tmp);
224 } /* }}} int data_copy */
226 /* Lookup a single mb_data_t instance, copy it and append the copy to another
228 static int data_copy_by_name(mb_data_t **dst, mb_data_t *src, /* {{{ */
232 if ((dst == NULL) || (src == NULL) || (name == NULL))
235 ptr = data_get_by_name(src, name);
239 return data_copy(dst, ptr);
240 } /* }}} int data_copy_by_name */
244 static int mb_submit(mb_host_t *host, mb_slave_t *slave, /* {{{ */
245 mb_data_t *data, value_t value) {
246 value_list_t vl = VALUE_LIST_INIT;
248 if ((host == NULL) || (slave == NULL) || (data == NULL))
251 if (host->interval == 0)
252 host->interval = plugin_get_interval();
254 if (slave->instance[0] == 0)
255 snprintf(slave->instance, sizeof(slave->instance), "slave_%i", slave->id);
259 vl.interval = host->interval;
260 sstrncpy(vl.host, host->host, sizeof(vl.host));
261 sstrncpy(vl.plugin, "modbus", sizeof(vl.plugin));
262 sstrncpy(vl.plugin_instance, slave->instance, sizeof(vl.plugin_instance));
263 sstrncpy(vl.type, data->type, sizeof(vl.type));
264 sstrncpy(vl.type_instance, data->instance, sizeof(vl.type_instance));
266 return plugin_dispatch_values(&vl);
267 } /* }}} int mb_submit */
269 static float mb_register_to_float(uint16_t hi, uint16_t lo) /* {{{ */
277 #if BYTE_ORDER == LITTLE_ENDIAN
279 conv.b[0] = lo & 0x00ff;
280 conv.b[1] = (lo >> 8) & 0x00ff;
281 conv.b[2] = hi & 0x00ff;
282 conv.b[3] = (hi >> 8) & 0x00ff;
284 conv.b[3] = lo & 0x00ff;
285 conv.b[2] = (lo >> 8) & 0x00ff;
286 conv.b[1] = hi & 0x00ff;
287 conv.b[0] = (hi >> 8) & 0x00ff;
291 } /* }}} float mb_register_to_float */
295 static int mb_init_connection(mb_host_t *host) /* {{{ */
303 modbus_set_debug(&host->connection, 1);
306 /* We'll do the error handling ourselves. */
307 modbus_set_error_handling(&host->connection, NOP_ON_ERROR);
309 if (host->conntype == MBCONN_TCP) {
310 if ((host->port < 1) || (host->port > 65535))
311 host->port = MODBUS_TCP_DEFAULT_PORT;
313 DEBUG("Modbus plugin: Trying to connect to \"%s\", port %i.", host->node,
316 modbus_init_tcp(&host->connection,
317 /* host = */ host->node,
318 /* port = */ host->port);
319 } else /* MBCONN_RTU */
321 DEBUG("Modbus plugin: Trying to connect to \"%s\".", host->node);
323 modbus_init_rtu(&host->connection,
324 /* device = */ host->node,
325 /* baudrate = */ host->baudrate, 'N', 8, 1, 0);
328 status = modbus_connect(&host->connection);
330 ERROR("Modbus plugin: modbus_connect (%s, %i) failed with status %i.",
331 host->node, host->port ? host->port : host->baudrate, status);
335 host->is_connected = 1;
337 } /* }}} int mb_init_connection */
338 /* #endif LEGACY_LIBMODBUS */
340 #else /* if !LEGACY_LIBMODBUS */
342 static int mb_init_connection(mb_host_t *host) /* {{{ */
349 if (host->connection != NULL)
352 if (host->conntype == MBCONN_TCP) {
353 if ((host->port < 1) || (host->port > 65535))
354 host->port = MODBUS_TCP_DEFAULT_PORT;
356 DEBUG("Modbus plugin: Trying to connect to \"%s\", port %i.", host->node,
359 host->connection = modbus_new_tcp(host->node, host->port);
360 if (host->connection == NULL) {
361 ERROR("Modbus plugin: Creating new Modbus/TCP object failed.");
365 DEBUG("Modbus plugin: Trying to connect to \"%s\", baudrate %i.",
366 host->node, host->baudrate);
368 host->connection = modbus_new_rtu(host->node, host->baudrate, 'N', 8, 1);
369 if (host->connection == NULL) {
370 ERROR("Modbus plugin: Creating new Modbus/RTU object failed.");
376 modbus_set_debug(host->connection, 1);
379 /* We'll do the error handling ourselves. */
380 modbus_set_error_recovery(host->connection, 0);
382 status = modbus_connect(host->connection);
384 ERROR("Modbus plugin: modbus_connect (%s, %i) failed with status %i.",
385 host->node, host->port ? host->port : host->baudrate, status);
386 modbus_free(host->connection);
387 host->connection = NULL;
392 } /* }}} int mb_init_connection */
393 #endif /* !LEGACY_LIBMODBUS */
395 #define CAST_TO_VALUE_T(ds, vt, raw) \
397 if ((ds)->ds[0].type == DS_TYPE_COUNTER) \
398 (vt).counter = (counter_t)(raw); \
399 else if ((ds)->ds[0].type == DS_TYPE_GAUGE) \
400 (vt).gauge = (gauge_t)(raw); \
401 else if ((ds)->ds[0].type == DS_TYPE_DERIVE) \
402 (vt).derive = (derive_t)(raw); \
403 else /* if (ds->ds[0].type == DS_TYPE_ABSOLUTE) */ \
404 (vt).absolute = (absolute_t)(raw); \
407 static int mb_read_data(mb_host_t *host, mb_slave_t *slave, /* {{{ */
409 uint16_t values[2] = {0};
411 const data_set_t *ds;
414 if ((host == NULL) || (slave == NULL) || (data == NULL))
417 ds = plugin_get_ds(data->type);
419 ERROR("Modbus plugin: Type \"%s\" is not defined.", data->type);
423 if (ds->ds_num != 1) {
424 ERROR("Modbus plugin: The type \"%s\" has %" PRIsz " data sources. "
425 "I can only handle data sets with only one data source.",
426 data->type, ds->ds_num);
430 if ((ds->ds[0].type != DS_TYPE_GAUGE) &&
431 (data->register_type != REG_TYPE_INT32) &&
432 (data->register_type != REG_TYPE_INT32_CDAB) &&
433 (data->register_type != REG_TYPE_UINT32) &&
434 (data->register_type != REG_TYPE_UINT32_CDAB)) {
436 "Modbus plugin: The data source of type \"%s\" is %s, not gauge. "
437 "This will most likely result in problems, because the register type "
439 data->type, DS_TYPE_TO_STRING(ds->ds[0].type));
442 if ((data->register_type == REG_TYPE_INT32) ||
443 (data->register_type == REG_TYPE_INT32_CDAB) ||
444 (data->register_type == REG_TYPE_UINT32) ||
445 (data->register_type == REG_TYPE_UINT32_CDAB) ||
446 (data->register_type == REG_TYPE_FLOAT) ||
447 (data->register_type == REG_TYPE_FLOAT_CDAB))
452 if (host->connection == NULL) {
454 } else if (host->conntype == MBCONN_TCP) {
455 /* getpeername() is used only to determine if the socket is connected, not
456 * because we're really interested in the peer's IP address. */
457 if (getpeername(modbus_get_socket(host->connection),
458 (void *)&(struct sockaddr_storage){0},
459 &(socklen_t){sizeof(struct sockaddr_storage)}) != 0)
463 if ((status == EBADF) || (status == ENOTSOCK) || (status == ENOTCONN)) {
464 status = mb_init_connection(host);
466 ERROR("Modbus plugin: mb_init_connection (%s/%s) failed. ", host->host,
468 host->is_connected = 0;
469 host->connection = NULL;
472 } else if (status != 0) {
474 modbus_close(&host->connection);
476 modbus_close(host->connection);
477 modbus_free(host->connection);
482 /* Version 2.0.3: Pass the connection struct as a pointer and pass the slave
483 * id to each call of "read_holding_registers". */
484 #define modbus_read_registers(ctx, addr, nb, dest) \
485 read_holding_registers(&(ctx), slave->id, (addr), (nb), (dest))
486 #else /* if !LEGACY_LIBMODBUS */
487 /* Version 2.9.2: Set the slave id once before querying the registers. */
488 status = modbus_set_slave(host->connection, slave->id);
490 ERROR("Modbus plugin: modbus_set_slave (%i) failed with status %i.",
495 if (data->modbus_register_type == MREG_INPUT) {
496 status = modbus_read_input_registers(host->connection,
497 /* start_addr = */ data->register_base,
498 /* num_registers = */ values_num,
499 /* buffer = */ values);
501 status = modbus_read_registers(host->connection,
502 /* start_addr = */ data->register_base,
503 /* num_registers = */ values_num,
504 /* buffer = */ values);
506 if (status != values_num) {
507 ERROR("Modbus plugin: modbus read function (%s/%s) failed. "
508 " status = %i, start_addr = %i, values_num = %i. Giving up.",
509 host->host, host->node, status, data->register_base, values_num);
511 modbus_close(&host->connection);
513 modbus_close(host->connection);
514 modbus_free(host->connection);
516 host->connection = NULL;
520 DEBUG("Modbus plugin: mb_read_data: Success! "
521 "modbus_read_registers returned with status %i.",
524 if (data->register_type == REG_TYPE_FLOAT) {
528 float_value = mb_register_to_float(values[0], values[1]);
529 DEBUG("Modbus plugin: mb_read_data: "
530 "Returned float value is %g",
531 (double)float_value);
533 CAST_TO_VALUE_T(ds, vt, float_value);
534 mb_submit(host, slave, data, vt);
535 } else if (data->register_type == REG_TYPE_FLOAT_CDAB) {
539 float_value = mb_register_to_float(values[1], values[0]);
540 DEBUG("Modbus plugin: mb_read_data: "
541 "Returned float value is %g",
542 (double)float_value);
544 CAST_TO_VALUE_T(ds, vt, float_value);
545 mb_submit(host, slave, data, vt);
546 } else if (data->register_type == REG_TYPE_INT32) {
553 v.u32 = (((uint32_t)values[0]) << 16) | ((uint32_t)values[1]);
554 DEBUG("Modbus plugin: mb_read_data: "
555 "Returned int32 value is %" PRIi32,
558 CAST_TO_VALUE_T(ds, vt, v.i32);
559 mb_submit(host, slave, data, vt);
560 } else if (data->register_type == REG_TYPE_INT32_CDAB) {
567 v.u32 = (((uint32_t)values[1]) << 16) | ((uint32_t)values[0]);
568 DEBUG("Modbus plugin: mb_read_data: "
569 "Returned int32 value is %" PRIi32,
572 CAST_TO_VALUE_T(ds, vt, v.i32);
573 mb_submit(host, slave, data, vt);
574 } else if (data->register_type == REG_TYPE_INT16) {
583 DEBUG("Modbus plugin: mb_read_data: "
584 "Returned int16 value is %" PRIi16,
587 CAST_TO_VALUE_T(ds, vt, v.i16);
588 mb_submit(host, slave, data, vt);
589 } else if (data->register_type == REG_TYPE_UINT32) {
593 v32 = (((uint32_t)values[0]) << 16) | ((uint32_t)values[1]);
594 DEBUG("Modbus plugin: mb_read_data: "
595 "Returned uint32 value is %" PRIu32,
598 CAST_TO_VALUE_T(ds, vt, v32);
599 mb_submit(host, slave, data, vt);
600 } else if (data->register_type == REG_TYPE_UINT32_CDAB) {
604 v32 = (((uint32_t)values[1]) << 16) | ((uint32_t)values[0]);
605 DEBUG("Modbus plugin: mb_read_data: "
606 "Returned uint32 value is %" PRIu32,
609 CAST_TO_VALUE_T(ds, vt, v32);
610 mb_submit(host, slave, data, vt);
611 } else /* if (data->register_type == REG_TYPE_UINT16) */
615 DEBUG("Modbus plugin: mb_read_data: "
616 "Returned uint16 value is %" PRIu16,
619 CAST_TO_VALUE_T(ds, vt, values[0]);
620 mb_submit(host, slave, data, vt);
624 } /* }}} int mb_read_data */
626 static int mb_read_slave(mb_host_t *host, mb_slave_t *slave) /* {{{ */
631 if ((host == NULL) || (slave == NULL))
635 for (mb_data_t *data = slave->collect; data != NULL; data = data->next) {
636 status = mb_read_data(host, slave, data);
645 } /* }}} int mb_read_slave */
647 static int mb_read(user_data_t *user_data) /* {{{ */
653 if ((user_data == NULL) || (user_data->data == NULL))
656 host = user_data->data;
659 for (size_t i = 0; i < host->slaves_num; i++) {
660 status = mb_read_slave(host, host->slaves + i);
669 } /* }}} int mb_read */
673 static void data_free_one(mb_data_t *data) /* {{{ */
680 } /* }}} void data_free_one */
682 static void data_free_all(mb_data_t *data) /* {{{ */
693 } /* }}} void data_free_all */
695 static void slaves_free_all(mb_slave_t *slaves, size_t slaves_num) /* {{{ */
700 for (size_t i = 0; i < slaves_num; i++)
701 data_free_all(slaves[i].collect);
703 } /* }}} void slaves_free_all */
705 static void host_free(void *void_host) /* {{{ */
707 mb_host_t *host = void_host;
712 slaves_free_all(host->slaves, host->slaves_num);
714 } /* }}} void host_free */
716 /* Config functions */
718 static int mb_config_add_data(oconfig_item_t *ci) /* {{{ */
720 mb_data_t data = {0};
724 data.register_type = REG_TYPE_UINT16;
727 status = cf_util_get_string(ci, &data.name);
731 for (int i = 0; i < ci->children_num; i++) {
732 oconfig_item_t *child = ci->children + i;
734 if (strcasecmp("Type", child->key) == 0)
735 status = cf_util_get_string_buffer(child, data.type, sizeof(data.type));
736 else if (strcasecmp("Instance", child->key) == 0)
737 status = cf_util_get_string_buffer(child, data.instance,
738 sizeof(data.instance));
739 else if (strcasecmp("RegisterBase", child->key) == 0)
740 status = cf_util_get_int(child, &data.register_base);
741 else if (strcasecmp("RegisterType", child->key) == 0) {
743 status = cf_util_get_string_buffer(child, tmp, sizeof(tmp));
746 else if (strcasecmp("Int16", tmp) == 0)
747 data.register_type = REG_TYPE_INT16;
748 else if (strcasecmp("Int32", tmp) == 0)
749 data.register_type = REG_TYPE_INT32;
750 else if (strcasecmp("Int32LE", tmp) == 0)
751 data.register_type = REG_TYPE_INT32_CDAB;
752 else if (strcasecmp("Uint16", tmp) == 0)
753 data.register_type = REG_TYPE_UINT16;
754 else if (strcasecmp("Uint32", tmp) == 0)
755 data.register_type = REG_TYPE_UINT32;
756 else if (strcasecmp("Uint32LE", tmp) == 0)
757 data.register_type = REG_TYPE_UINT32_CDAB;
758 else if (strcasecmp("Float", tmp) == 0)
759 data.register_type = REG_TYPE_FLOAT;
760 else if (strcasecmp("FloatLE", tmp) == 0)
761 data.register_type = REG_TYPE_FLOAT_CDAB;
763 ERROR("Modbus plugin: The register type \"%s\" is unknown.", tmp);
766 } else if (strcasecmp("RegisterCmd", child->key) == 0) {
768 ERROR("Modbus plugin: RegisterCmd parameter can not be used "
769 "with your libmodbus version");
772 status = cf_util_get_string_buffer(child, tmp, sizeof(tmp));
775 else if (strcasecmp("ReadHolding", tmp) == 0)
776 data.modbus_register_type = MREG_HOLDING;
777 else if (strcasecmp("ReadInput", tmp) == 0)
778 data.modbus_register_type = MREG_INPUT;
780 ERROR("Modbus plugin: The modbus_register_type \"%s\" is unknown.",
786 ERROR("Modbus plugin: Unknown configuration option: %s", child->key);
792 } /* for (i = 0; i < ci->children_num; i++) */
794 assert(data.name != NULL);
795 if (data.type[0] == 0) {
796 ERROR("Modbus plugin: Data block \"%s\": No type has been specified.",
802 data_copy(&data_definitions, &data);
807 } /* }}} int mb_config_add_data */
809 static int mb_config_set_host_address(mb_host_t *host, /* {{{ */
810 const char *address) {
811 struct addrinfo *ai_list;
814 if ((host == NULL) || (address == NULL))
817 struct addrinfo ai_hints = {
818 /* XXX: libmodbus can only handle IPv4 addresses. */
819 .ai_family = AF_INET,
820 .ai_flags = AI_ADDRCONFIG};
822 status = getaddrinfo(address, /* service = */ NULL, &ai_hints, &ai_list);
824 ERROR("Modbus plugin: getaddrinfo failed: %s",
825 (status == EAI_SYSTEM) ? STRERRNO : gai_strerror(status));
829 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL;
830 ai_ptr = ai_ptr->ai_next) {
831 status = getnameinfo(ai_ptr->ai_addr, ai_ptr->ai_addrlen, host->node,
833 /* service = */ NULL, /* length = */ 0,
834 /* flags = */ NI_NUMERICHOST);
839 freeaddrinfo(ai_list);
842 ERROR("Modbus plugin: Unable to translate node name: \"%s\"", address);
843 else /* if (status == 0) */
845 DEBUG("Modbus plugin: mb_config_set_host_address: %s -> %s", address,
850 } /* }}} int mb_config_set_host_address */
852 static int mb_config_add_slave(mb_host_t *host, oconfig_item_t *ci) /* {{{ */
857 if ((host == NULL) || (ci == NULL))
860 slave = realloc(host->slaves, sizeof(*slave) * (host->slaves_num + 1));
863 host->slaves = slave;
864 slave = host->slaves + host->slaves_num;
865 memset(slave, 0, sizeof(*slave));
866 slave->collect = NULL;
868 status = cf_util_get_int(ci, &slave->id);
872 for (int i = 0; i < ci->children_num; i++) {
873 oconfig_item_t *child = ci->children + i;
875 if (strcasecmp("Instance", child->key) == 0)
876 status = cf_util_get_string_buffer(child, slave->instance,
877 sizeof(slave->instance));
878 else if (strcasecmp("Collect", child->key) == 0) {
880 status = cf_util_get_string_buffer(child, buffer, sizeof(buffer));
882 data_copy_by_name(&slave->collect, data_definitions, buffer);
883 status = 0; /* continue after failure. */
885 ERROR("Modbus plugin: Unknown configuration option: %s", child->key);
893 if ((status == 0) && (slave->collect == NULL))
901 else /* if (status != 0) */
902 data_free_all(slave->collect);
905 } /* }}} int mb_config_add_slave */
907 static int mb_config_add_host(oconfig_item_t *ci) /* {{{ */
912 host = calloc(1, sizeof(*host));
917 status = cf_util_get_string_buffer(ci, host->host, sizeof(host->host));
922 if (host->host[0] == 0) {
927 for (int i = 0; i < ci->children_num; i++) {
928 oconfig_item_t *child = ci->children + i;
931 if (strcasecmp("Address", child->key) == 0) {
932 char buffer[NI_MAXHOST];
933 status = cf_util_get_string_buffer(child, buffer, sizeof(buffer));
935 status = mb_config_set_host_address(host, buffer);
937 host->conntype = MBCONN_TCP;
938 } else if (strcasecmp("Port", child->key) == 0) {
939 host->port = cf_util_get_port_number(child);
942 } else if (strcasecmp("Device", child->key) == 0) {
943 status = cf_util_get_string_buffer(child, host->node, sizeof(host->node));
945 host->conntype = MBCONN_RTU;
946 } else if (strcasecmp("Baudrate", child->key) == 0)
947 status = cf_util_get_int(child, &host->baudrate);
948 else if (strcasecmp("Interval", child->key) == 0)
949 status = cf_util_get_cdtime(child, &host->interval);
950 else if (strcasecmp("Slave", child->key) == 0)
951 /* Don't set status: Gracefully continue if a slave fails. */
952 mb_config_add_slave(host, child);
954 ERROR("Modbus plugin: Unknown configuration option: %s", child->key);
960 } /* for (i = 0; i < ci->children_num; i++) */
962 assert(host->host[0] != 0);
963 if (host->node[0] == 0) {
964 ERROR("Modbus plugin: Data block \"%s\": No address or device has been "
969 if (host->conntype == MBCONN_RTU && !host->baudrate) {
970 ERROR("Modbus plugin: Data block \"%s\": No serial baudrate has been "
975 if ((host->conntype == MBCONN_TCP && host->baudrate) ||
976 (host->conntype == MBCONN_RTU && host->port)) {
977 ERROR("Modbus plugin: Data block \"%s\": You've mixed up RTU and TCP "
986 snprintf(name, sizeof(name), "modbus-%s", host->host);
988 plugin_register_complex_read(/* group = */ NULL, name,
989 /* callback = */ mb_read,
990 /* interval = */ host->interval,
992 .data = host, .free_func = host_free,
999 } /* }}} int mb_config_add_host */
1001 static int mb_config(oconfig_item_t *ci) /* {{{ */
1006 for (int i = 0; i < ci->children_num; i++) {
1007 oconfig_item_t *child = ci->children + i;
1009 if (strcasecmp("Data", child->key) == 0)
1010 mb_config_add_data(child);
1011 else if (strcasecmp("Host", child->key) == 0)
1012 mb_config_add_host(child);
1014 ERROR("Modbus plugin: Unknown configuration option: %s", child->key);
1018 } /* }}} int mb_config */
1022 static int mb_shutdown(void) /* {{{ */
1024 data_free_all(data_definitions);
1025 data_definitions = NULL;
1028 } /* }}} int mb_shutdown */
1030 void module_register(void) {
1031 plugin_register_complex_config("modbus", mb_config);
1032 plugin_register_shutdown("modbus", mb_shutdown);
1033 } /* void module_register */