Hi, all
I’m brand new to collectd, RRDtool, and mailing lists. If you don’t mind newbie
questions, here I come.
1. How best to dispatch multiple values using the Lua plugin?
The documentation I could find only gave an example of dispatching 1 value at a
time, so to parse the following readings on an OpenWrt device,
+QTEMP:"qfe_wtr_pa0","58"
+QTEMP:"qfe_wtr_pa1","59"
+QTEMP:"qfe_wtr_pa2","55"
+QTEMP:"qfe_wtr_pa3","54"
+QTEMP:"aoss0-usr","56"
+QTEMP:"mdm-q6-usr","58"
+QTEMP:"ipa-usr","57"
+QTEMP:"cpu0-a7-usr","56"
+QTEMP:"mdm-5g-usr","56"
+QTEMP:"mdm-vpe-usr","56"
+QTEMP:"mdm-core-usr","56"
+QTEMP:"xo-therm-usr","57"
+QTEMP:"sdx-case-therm-usr","57"
OK
I pieced together this Lua script:
function read()
serial = io.open("/dev/ttyUSB3", "a+")
serial:write("AT+QTEMP\r\n")
local result = {
plugin = 'lua',
plugin_instance = 'rm500q-gl',
type = 'temperature',
}
while true do
local line = serial:read()
if string.match(line, "^OK") or string.match(line, "^ERROR") or line ==
nil then
break
end
local sensor, temp = string.match(line, "^\+QTEMP:\"(.+)\",\"(.+)\"")
if sensor ~= nil then
result['type_instance'] = sensor
result['values'] = { temp }
collectd.dispatch_values(result)
end
end
serial:close()
return 0
end
collectd.register_read(read)
Is there a way to send all of them at once since the plugin expects a "values"
field?
2. The above code works, but should the numbers in the RRD database be off by a
bit?
An example dumped from temperature-cpu0-a7-usr.rrd shows that integers are not
integers anymore:
<!-- Round Robin Database Dump -->
<rrd>
<version> 0001 </version>
<step> 30 </step> <!-- Seconds -->
<lastupdate> 1720966705 </lastupdate> <!-- 2024-07-14 22:18:25 CST -->
<ds>
<name> value </name>
<type> GAUGE </type>
<minimal_heartbeat> 60 </minimal_heartbeat>
<min> NaN </min>
<max> NaN </max>
<!-- PDP Status -->
<last_ds> UNKN </last_ds>
<value> 1.3250000000e+03 </value>
<unknown_sec> 0 </unknown_sec>
</ds>
<!-- Round Robin Archives -->
<rra>
<cf> AVERAGE </cf>
<pdp_per_row> 1 </pdp_per_row> <!-- 30 seconds -->
<xff> 1.0000000000e-01 </xff>
<cdp_prep>
<ds><value> NaN </value> <unknown_datapoints> 0
</unknown_datapoints></ds>
</cdp_prep>
<database>
...
<!-- 2024-07-14 22:18:00 CST / 1720966680 --> <row><v>
5.3000000000e+01 </v></row>
<!-- 2024-07-14 22:18:30 CST / 1720966710 --> <row><v>
5.3333333333e+01 </v></row>
<!-- 2024-07-14 22:19:00 CST / 1720966740 --> <row><v>
5.5000000000e+01 </v></row>
<!-- 2024-07-14 22:19:30 CST / 1720966770 --> <row><v>
5.5000000000e+01 </v></row>
<!-- 2024-07-14 22:20:00 CST / 1720966800 --> <row><v>
5.4833333333e+01 </v></row>
<!-- 2024-07-14 22:20:30 CST / 1720966830 --> <row><v>
5.4000000000e+01 </v></row>
<!-- 2024-07-14 22:21:00 CST / 1720966860 --> <row><v>
5.3833333333e+01 </v></row>
<!-- 2024-07-14 22:21:30 CST / 1720966890 --> <row><v>
5.3000000000e+01 </v></row>
<!-- 2024-07-14 22:22:00 CST / 1720966920 --> <row><v>
5.3000000000e+01 </v></row>
<!-- 2024-07-14 22:22:30 CST / 1720966950 --> <row><v>
5.3166666667e+01 </v></row>
<!-- 2024-07-14 22:23:00 CST / 1720966980 --> <row><v>
5.4333333333e+01 </v></row>
<!-- 2024-07-14 22:23:30 CST / 1720967010 --> <row><v>
5.6000000000e+01 </v></row>
<!-- 2024-07-14 22:24:00 CST / 1720967040 --> <row><v>
5.6166666667e+01 </v></row>
...
The RRDtool documentation explained normalizing and consolidating. What can I
do to skip them in this case?
Best Regards,
Bowen
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