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