Room temperature monitoring with Sensormetrix device

[Michael0]

Hi!

I´m trying to get my sensormetrix EM01b-STN working with zabbix to monitor the server room temperature via snmp.
I´m able to reach the device from the zabbix server, the monitoring device gives the following entries back:

bN028095TC: 23.1HU:34.6%IL: 1.9

TC: temperature
HU: humidity
IL: light

I just need a check if the temp, is higher than XX celsius

Which item key and SNMP OID I have to use for this?

Thanks for input!

[Colttt]

soory i dont know.. but try this:

snmpwalk -v2c -c public IP

[Michael0]

Thanks for your tipp!

But I only get a timeout back...

On the manufacturer site I found good how to´s for Nagios&Cacti:

http://www.sensormetrix.co.uk/product.php?id=12

When I access it via HTTP I get this infos back:

hN028095TC: 23.2HU:34.6%IL: 6.9

So maybe I could just read the output for TC: xxx celcius and set a trigger for it >30° ...?

[Michael0]

ok, looks like the temp. device is not really good to answer via snmp...

How could I just setup a http webcheck to grep for the temperature which the device gives me back:

hN028095TC: 23.2HU:34.6%IL: 6.9

I just want to get an alert when "TC: xx.x" is >30°C

Could I just setup an item which grep´s for it?

[Colttt]

you can try this as a userparameter:

wget -q -O - http://YOU-IP/ | grep -A TEMPERATUR| cut -d : -f2 |cut -b 2-5

[Michael0]

Thanks for you hint!

I have created an external script for this with the curl command:

curl -s IP_ADDRESS | grep TC* | cut -c 27-30

output: 23.1

The check would perfectly work now, but the problem is that the temperature device does not always returns a value back....

When I manually run the script on the zabbix server I get 7 from 10 values back from the temperature device
So, the item with this external script, became always "unsupported" when no value returns :/

Is there any chance to do a work around for this?

[Colttt]

hmmm i think you must check why you get not a response..

otherwise you can use somthing like this:

curl -s IP_ADDRESS | grep TC* | cut -c 27-30 || echo "fake_TEMP"

[Heilig]

How long does it take to get results (execute "time script_name")?
If your script takes more than 3 seconds to finish, try to increase the timeout parameter in zabbix_server.conf (default value is 3 seconds) or use zabbix_sender (script works, gathers the data and pushes it to Zabbix using the zabbix_sender).

[Michael0]

the script response is fast maybe 0.5 sec until the value is displayed...

How can I combine the script to give me back the value (which works already) and if no value returns then use just the "fake" temp, I´m really new to scripting :/

currently its working, because I adjusted the "check the not supported items" value in the zabbix admin GUI to 9mins.
So if the item became "not supported" status, zabbix will automatically enable it after 9mins again.
But thats a really dirty solution for me

[Colttt]

How can I combine the script to give me back the value (which works already) and if no value returns then use just the "fake" temp, I´m really new to scripting :/

hmmm i think you must check why you get not a response..

otherwise you can use somthing like this:

curl -s IP_ADDRESS | grep TC* | cut -c 27-30 || echo "fake_TEMP"

i think this work

[Michael0]

ok just to be sure...

Code:
curl -s IP_ADDRESS | grep TC* | cut -c 27-30 || echo "fake_TEMP"

I have tried this and when I execute the script several times until I get no value back, what should I get back? the "fake_temp"?

Because I get no value back also not the "fake_temp" when I dont get the real temp. back either

[c.mammoli]

Not to be harsh but the only task a temperature sensor should do is "report the temperature". And this device not only doesn't support SNMP, but it even fails 30% of http gets?
I would return it.

[Michael0]

Yes, you are 100% right!

I´m also not very happy with this "flapping" device.

So we decided to replace it against some other device from e.g. watchdog, which is also communicating via snmp

[Colttt]

you can use this one:

http://www.thomas-krenn.com/en/products/server-accessory/networkcabinet/rms/knuerr-rack-monitoring-system-compact.html

or this one (for laboratorys and data center)