check temperature through a T3511 device

Project Notes

+ Check Temperature

toc

++ Introduction

This module will check the temperature reading from a T3511 device from Comet.

++ The device

The T3511 device from Comet read the temperature and relative humidity in the air surrounding the measuring probe.

++ The module

The module itself will download a web page from the temperature device using _wget_.

The web page is parsed for the temperature reading, which is then compared to the threasholds sent to the module.

More information on this environmental monitoring device can be found here:

http://www.cometsystem.cz/english/humidity-transmitter-ethernet.htm

+++ Usage

$ ./check_temperature.sh
Usage: check_temperature.sh -h, --help

check_temperature.sh -V, --version
check_temperature.sh DEVICE_ADDRESS WARNING_TRESHOLD CRITICAL_TRESHOLD

Example:

mluebeck@dmz0vp-nag1:/usr/local/nagios/libexec30$ ./check_temperature.sh temp01 25 30
Temperature OK - TEMP: 21

mluebeck@dmz0vp-nag1:/usr/local/nagios/libexec31$ ./check_temperature.sh temp01 20 25
WARNING - TEMP TOO HIGH - TEMP: 21
mluebeck@dmz0vp-nag1:/usr/local/nagios/libexec32

$ ./check_temperature.sh temp01 15 20
CRITICAL - TEMP TOO HIGH - TEMP: 21

$ ./check_temperature.sh wrong_device_address 15 20
CRITICAL - NO RESPONSE FROM THE DEVICE

+++ Installation

Place the check_temperature.sh script in your libexec directory.

In the chkcommands.cfg file, add the following:

#---------------------------------
# MaLu 9.8.06, check_temperature
# This checks the temperature of our
# networked thermometer devices
#---------------------------------
# 'check_TEMP' command definition
define command{

command_name check_temp
command_line $USER1$/check_temperature.sh $HOSTADDRESS$ $ARG1$ $ARG2$
}

Example of service definition:

define service{

host_name trh_002
service_description Environmental check - Temperature
servicegroups check-environment
check_command check_temp!24!26
max_check_attempts 3
normal_check_interval 5
retry_check_interval 1
check_period ACA_24x7
notification_interval 1440
notification_period ACA_24x7
notification_options w,u,c,r,f
contact_groups ContactUnix_SMS,ContactUnix_noSMS,ContactNetworkWindows_noSMS,ContactNetworkWindows_SMS

}

+++ Dependencies

This module relies on the following tools to be installed on your system:

* wget
* awk
* perl