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collectd: backport modbus improvements

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* 938897a2 Add scale and shift to modbus plugin
 * 60280b80 correcting all the wrongs
 * a00ab529 Add support for RS485 to modbus plugin

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2019-04-12 12:13:36 +02:00
parent 56f71a8623
commit f70364df8b
4 changed files with 316 additions and 1 deletions
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2
utils/collectd/Makefile
View File

@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=collectd
PKG_VERSION:=5.8.1
PKG_RELEASE:=3
PKG_RELEASE:=4
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
PKG_SOURCE_URL:=https://collectd.org/files/ \

81
utils/collectd/patches/051-Add-scale-and-shift-to-modbus-plugin.patch Normal file
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@ -0,0 +1,81 @@
From eeabc41e703f39cae0ad7eb8a596045a5a2f25b4 Mon Sep 17 00:00:00 2001
From: cekstam <christian.ekstam@gmail.com>
Date: Tue, 27 Mar 2018 13:15:28 +0200
Subject: [PATCH 1/3] Add scale and shift to modbus plugin
Adding a Scale and Shift parameter to the modbus plugin in order to correct amplifed data
---
src/collectd.conf.pod | 10 ++++++++++
src/modbus.c | 18 ++++++++++++++----
2 files changed, 24 insertions(+), 4 deletions(-)
--- a/src/collectd.conf.pod
+++ b/src/collectd.conf.pod
@@ -4169,6 +4169,16 @@ supported.
Sets the type instance to use when dispatching the value to I<collectd>. If
unset, an empty string (no type instance) is used.
+=item B<Scale> I<Value>
+
+The values taken from collectd are multiplied by I<Value>. The field is optional
+and the default is B<1.0>.
+
+=item B<Shift> I<Value>
+
+I<Value> is added to values from collectd after they have been multiplied by
+B<Scale> value. The field is optional and the default value is B<0.0>.
+
=back
=item E<lt>B<Host> I<Name>E<gt> blocks
--- a/src/modbus.c
+++ b/src/modbus.c
@@ -105,6 +105,8 @@ struct mb_data_s /* {{{ */
mb_mreg_type_t modbus_register_type;
char type[DATA_MAX_NAME_LEN];
char instance[DATA_MAX_NAME_LEN];
+ double scale;
+ double shift;
mb_data_t *next;
}; /* }}} */
@@ -395,13 +397,13 @@ static int mb_init_connection(mb_host_t
#define CAST_TO_VALUE_T(ds, vt, raw) \
do { \
if ((ds)->ds[0].type == DS_TYPE_COUNTER) \
- (vt).counter = (counter_t)(raw); \
+ (vt).counter = (((counter_t)(raw) * ds[0].scale) + ds[0].shift); \
else if ((ds)->ds[0].type == DS_TYPE_GAUGE) \
- (vt).gauge = (gauge_t)(raw); \
+ (vt).gauge = (((gauge_t)(raw) * ds[0].scale) + ds[0].shift); \
else if ((ds)->ds[0].type == DS_TYPE_DERIVE) \
- (vt).derive = (derive_t)(raw); \
+ (vt).derive = (((derive_t)(raw) * ds[0].scale) + ds[0].shift); \
else /* if (ds->ds[0].type == DS_TYPE_ABSOLUTE) */ \
- (vt).absolute = (absolute_t)(raw); \
+ (vt).absolute = (((absolute_t)(raw) * ds[0].scale) + ds[0].shift); \
} while (0)
static int mb_read_data(mb_host_t *host, mb_slave_t *slave, /* {{{ */
@@ -723,6 +725,8 @@ static int mb_config_add_data(oconfig_it
data.name = NULL;
data.register_type = REG_TYPE_UINT16;
data.next = NULL;
+ data.scale = 1;
+ data.shift = 0;
status = cf_util_get_string(ci, &data.name);
if (status != 0)
@@ -736,6 +740,12 @@ static int mb_config_add_data(oconfig_it
else if (strcasecmp("Instance", child->key) == 0)
status = cf_util_get_string_buffer(child, data.instance,
sizeof(data.instance));
+ else if (strcasecmp("Scale", child->key) == 0)
+ status = cf_util_get_string_buffer(child, data.scale,
+ sizeof(data.scale));
+ else if (strcasecmp("Shift", child->key) == 0)
+ status = cf_util_get_string_buffer(child, data.shift,
+ sizeof(data.shift));
else if (strcasecmp("RegisterBase", child->key) == 0)
status = cf_util_get_int(child, &data.register_base);
else if (strcasecmp("RegisterType", child->key) == 0) {

120
utils/collectd/patches/052-correcting-all-the-wrongs.patch Normal file
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@ -0,0 +1,120 @@
From e596496f5c783f4bba85c4d559502c98e4050465 Mon Sep 17 00:00:00 2001
From: cekstam <christian.ekstam@gmail.com>
Date: Tue, 27 Mar 2018 14:11:52 +0200
Subject: [PATCH 2/3] correcting all the wrongs
, data->scale, data->shift
---
src/modbus.c | 32 +++++++++++++++-----------------
1 file changed, 15 insertions(+), 17 deletions(-)
--- a/src/modbus.c
+++ b/src/modbus.c
@@ -394,16 +394,16 @@ static int mb_init_connection(mb_host_t
} /* }}} int mb_init_connection */
#endif /* !LEGACY_LIBMODBUS */
-#define CAST_TO_VALUE_T(ds, vt, raw) \
+#define CAST_TO_VALUE_T(ds, vt, raw, scale, shift) \
do { \
if ((ds)->ds[0].type == DS_TYPE_COUNTER) \
- (vt).counter = (((counter_t)(raw) * ds[0].scale) + ds[0].shift); \
+ (vt).counter = (((counter_t)(raw) * scale) + shift); \
else if ((ds)->ds[0].type == DS_TYPE_GAUGE) \
- (vt).gauge = (((gauge_t)(raw) * ds[0].scale) + ds[0].shift); \
+ (vt).gauge = (((gauge_t)(raw) * scale) + shift); \
else if ((ds)->ds[0].type == DS_TYPE_DERIVE) \
- (vt).derive = (((derive_t)(raw) * ds[0].scale) + ds[0].shift); \
+ (vt).derive = (((derive_t)(raw) * scale) + shift); \
else /* if (ds->ds[0].type == DS_TYPE_ABSOLUTE) */ \
- (vt).absolute = (((absolute_t)(raw) * ds[0].scale) + ds[0].shift); \
+ (vt).absolute = (((absolute_t)(raw) * scale) + shift); \
} while (0)
static int mb_read_data(mb_host_t *host, mb_slave_t *slave, /* {{{ */
@@ -532,7 +532,7 @@ static int mb_read_data(mb_host_t *host,
"Returned float value is %g",
(double)float_value);
- CAST_TO_VALUE_T(ds, vt, float_value);
+ CAST_TO_VALUE_T(ds, vt, float_value, data->scale, data->shift);
mb_submit(host, slave, data, vt);
} else if (data->register_type == REG_TYPE_FLOAT_CDAB) {
float float_value;
@@ -543,7 +543,7 @@ static int mb_read_data(mb_host_t *host,
"Returned float value is %g",
(double)float_value);
- CAST_TO_VALUE_T(ds, vt, float_value);
+ CAST_TO_VALUE_T(ds, vt, float_value, data->scale, data->shift);
mb_submit(host, slave, data, vt);
} else if (data->register_type == REG_TYPE_INT32) {
union {
@@ -557,7 +557,7 @@ static int mb_read_data(mb_host_t *host,
"Returned int32 value is %" PRIi32,
v.i32);
- CAST_TO_VALUE_T(ds, vt, v.i32);
+ CAST_TO_VALUE_T(ds, vt, v.i32, data->scale, data->shift);
mb_submit(host, slave, data, vt);
} else if (data->register_type == REG_TYPE_INT32_CDAB) {
union {
@@ -571,7 +571,7 @@ static int mb_read_data(mb_host_t *host,
"Returned int32 value is %" PRIi32,
v.i32);
- CAST_TO_VALUE_T(ds, vt, v.i32);
+ CAST_TO_VALUE_T(ds, vt, v.i32, data->scale, data->shift);
mb_submit(host, slave, data, vt);
} else if (data->register_type == REG_TYPE_INT16) {
union {
@@ -586,7 +586,7 @@ static int mb_read_data(mb_host_t *host,
"Returned int16 value is %" PRIi16,
v.i16);
- CAST_TO_VALUE_T(ds, vt, v.i16);
+ CAST_TO_VALUE_T(ds, vt, v.i16, data->scale, data->shift);
mb_submit(host, slave, data, vt);
} else if (data->register_type == REG_TYPE_UINT32) {
uint32_t v32;
@@ -597,7 +597,7 @@ static int mb_read_data(mb_host_t *host,
"Returned uint32 value is %" PRIu32,
v32);
- CAST_TO_VALUE_T(ds, vt, v32);
+ CAST_TO_VALUE_T(ds, vt, v32, data->scale, data->shift);
mb_submit(host, slave, data, vt);
} else if (data->register_type == REG_TYPE_UINT32_CDAB) {
uint32_t v32;
@@ -608,7 +608,7 @@ static int mb_read_data(mb_host_t *host,
"Returned uint32 value is %" PRIu32,
v32);
- CAST_TO_VALUE_T(ds, vt, v32);
+ CAST_TO_VALUE_T(ds, vt, v32, data->scale, data->shift);
mb_submit(host, slave, data, vt);
} else /* if (data->register_type == REG_TYPE_UINT16) */
{
@@ -618,7 +618,7 @@ static int mb_read_data(mb_host_t *host,
"Returned uint16 value is %" PRIu16,
values[0]);
- CAST_TO_VALUE_T(ds, vt, values[0]);
+ CAST_TO_VALUE_T(ds, vt, values[0], data->scale, data->shift);
mb_submit(host, slave, data, vt);
}
@@ -741,11 +741,9 @@ static int mb_config_add_data(oconfig_it
status = cf_util_get_string_buffer(child, data.instance,
sizeof(data.instance));
else if (strcasecmp("Scale", child->key) == 0)
- status = cf_util_get_string_buffer(child, data.scale,
- sizeof(data.scale));
+ status = cf_util_get_double(child, &data.scale);
else if (strcasecmp("Shift", child->key) == 0)
- status = cf_util_get_string_buffer(child, data.shift,
- sizeof(data.shift));
+ status = cf_util_get_double(child, &data.shift);
else if (strcasecmp("RegisterBase", child->key) == 0)
status = cf_util_get_int(child, &data.register_base);
else if (strcasecmp("RegisterType", child->key) == 0) {

114
utils/collectd/patches/053-Add-support-for-RS485-to-modbus-plugin.patch Normal file
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@ -0,0 +1,114 @@
From a00ab52931a587cf29c53a945e9295b4d7fe41ba Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Thu, 28 Mar 2019 01:52:04 +0100
Subject: [PATCH] Add support for RS485 to modbus plugin
Allow setting up RS485 mode for Modbus-RTU
---
src/collectd.conf.pod | 6 +++++
src/modbus.c | 55 +++++++++++++++++++++++++++++++++++++++----
2 files changed, 57 insertions(+), 4 deletions(-)
--- a/src/collectd.conf.pod
+++ b/src/collectd.conf.pod
@@ -4234,6 +4234,12 @@ For Modbus/RTU, specifies the path to th
For Modbus/RTU, specifies the baud rate of the serial device.
Note, connections currently support only 8/N/1.
+=item B<UARTType> I<UARTType>
+
+For Modbus/RTU, specifies the type of the serial device.
+RS232, RS422 and RS485 are supported. Defaults to RS232.
+Available only on Linux systems with libmodbus>=2.9.4.
+
=item B<Interval> I<Interval>
Sets the interval (in seconds) in which the values will be collected from this
--- a/src/modbus.c
+++ b/src/modbus.c
@@ -95,6 +95,12 @@ enum mb_conntype_e /* {{{ */
MBCONN_RTU }; /* }}} */
typedef enum mb_conntype_e mb_conntype_t;
+enum mb_uarttype_e /* {{{ */
+{ UARTTYPE_RS232,
+ UARTTYPE_RS422,
+ UARTTYPE_RS485 }; /* }}} */
+typedef enum mb_uarttype_e mb_uarttype_t;
+
struct mb_data_s;
typedef struct mb_data_s mb_data_t;
struct mb_data_s /* {{{ */
@@ -124,8 +130,9 @@ struct mb_host_s /* {{{ */
char host[DATA_MAX_NAME_LEN];
char node[NI_MAXHOST]; /* TCP hostname or RTU serial device */
/* char service[NI_MAXSERV]; */
- int port; /* for Modbus/TCP */
- int baudrate; /* for Modbus/RTU */
+ int port; /* for Modbus/TCP */
+ int baudrate; /* for Modbus/RTU */
+ mb_uarttype_t uarttype; /* UART type for Modbus/RTU */
mb_conntype_t conntype;
cdtime_t interval;
@@ -390,6 +397,22 @@ static int mb_init_connection(mb_host_t
return status;
}
+#if defined(linux) && LIBMODBUS_VERSION_CHECK(2, 9, 4)
+ switch (host->uarttype) {
+ case UARTTYPE_RS485:
+ if (modbus_rtu_set_serial_mode(host->connection, MODBUS_RTU_RS485))
+ DEBUG("Modbus plugin: Setting RS485 mode failed.");
+ break;
+ case UARTTYPE_RS422:
+ /* libmodbus doesn't say anything about full-duplex symmetric RS422 UART */
+ break;
+ case UARTTYPE_RS232:
+ break;
+ default:
+ DEBUG("Modbus plugin: Invalid UART type!.");
+ }
+#endif /* defined(linux) && LIBMODBUS_VERSION_CHECK(2, 9, 4) */
+
return 0;
} /* }}} int mb_init_connection */
#endif /* !LEGACY_LIBMODBUS */
@@ -951,11 +974,35 @@ static int mb_config_add_host(oconfig_it
status = -1;
} else if (strcasecmp("Device", child->key) == 0) {
status = cf_util_get_string_buffer(child, host->node, sizeof(host->node));
- if (status == 0)
+ if (status == 0) {
host->conntype = MBCONN_RTU;
+ host->uarttype = UARTTYPE_RS232;
+ }
} else if (strcasecmp("Baudrate", child->key) == 0)
status = cf_util_get_int(child, &host->baudrate);
- else if (strcasecmp("Interval", child->key) == 0)
+ else if (strcasecmp("UARTType", child->key) == 0) {
+#if defined(linux) && !LEGACY_LIBMODBUS && LIBMODBUS_VERSION_CHECK(2, 9, 4)
+ char buffer[NI_MAXHOST];
+ status = cf_util_get_string_buffer(child, buffer, sizeof(buffer));
+ if (status != 0)
+ break;
+ if (strncmp(buffer, "RS485", 6) == 0)
+ host->uarttype = UARTTYPE_RS485;
+ else if (strncmp(buffer, "RS422", 6) == 0)
+ host->uarttype = UARTTYPE_RS422;
+ else if (strncmp(buffer, "RS232", 6) == 0)
+ host->uarttype = UARTTYPE_RS232;
+ else {
+ ERROR("Modbus plugin: The UARTType \"%s\" is unknown.", buffer);
+ status = -1;
+ break;
+ }
+#else
+ ERROR("Modbus plugin: Option `UARTType' not supported. Please "
+ "upgrade libmodbus to at least 2.9.4");
+ return -1;
+#endif
+ } else if (strcasecmp("Interval", child->key) == 0)
status = cf_util_get_cdtime(child, &host->interval);
else if (strcasecmp("Slave", child->key) == 0)
/* Don't set status: Gracefully continue if a slave fails. */