added Raspberry Pi CPU temperature reading

please note: CLI change: now need to specify which device to read!

Documentation updated accordingly

README.md

@@ -25,7 +25,7 @@ This repository contains the following scripts:
   * [check_otp](#check_otp)
     plugin to monitor PrivacyIDEA (and LinOTP) OTP validation
   * [check_temperature](#check_temperature)
-    plugin to monitor the temperature of a 1-wire sensor on a RaspberryPi
+    plugin to monitor the CPU temperature of a RaspberryPi or that of a DS18b20  1-wire sensor on a RaspberryPi
   * [nagiosstatus](#nagiosstatus)
     CGI-BIN script to report the status of nagios (to monitor nagios itself)
 
@@ -237,15 +237,16 @@ define service {
 
 <a name=check_temperature>plugins/check_temperature</a>
 -------------------------------------------------------
-Plugin (check) to monitor monitor the temperature using a sensor connected to a
-RaspberryPi. This implementation is specifically for the DS18B20 1-wire
-temperature sensor. Other methods and interfaces can be plugged in easily (just
-raise a request or provide a patch). For information on how to connect sensor
-to the RaspberryPi and to get it working please see [this Adafruit tutorial](
+Plugin (check) to monitor monitor the Raspberry Pi CPU temperature or that of a
+temperature sensor connected to a RaspberryPi. This implementation currently
+supports the DS18B20 1-wire temperature sensor. Other methods and interfaces can
+be plugged in easily (just raise a request or provide a patch). For information
+on how to connect sensor to the RaspberryPi and to get it working please see
+[this Adafruit tutorial](
 https://learn.adafruit.com/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing).
 
-To enable the 1-wire interface support on the RaspberryPi one can use the
-command:
+No setup is required to read the CPU temperature. To enable the 1-wire interface
+support on the RaspberryPi one can use the command:
 ~~~
    sudo raspi-config nonint do_onewire 0
 ~~~
@@ -256,32 +257,46 @@ Installation for is straightforward, after installing the script on the server
 add the following to your Nagios `commands.cmd` configuration file:
 
 ~~~
+# 'check_cpu_temperature' command definition to monitor CPU temperature in C
+# parameters: warning (ARG1) and critical (ARG2) temperature in Celcius
+define command {
+        command_name    check_temperature
+        command_line    [install_path]/plugins/check_temperature -w $ARG1$ -c $ARG2$ rpi_cpu
+}
+
+# 'check_cpu_ftemperature' command definition to monitor CPU temperature in F
+# parameters: warning (ARG1) and critical (ARG2) temperature in Celcius
+define command {
+        command_name    check_temperature
+        command_line    [install_path]/plugins/check_temperature -F -w $ARG1$ -c $ARG2$ rpi_cpu
+}
+
 # 'check_temperature' command definition to monitor a single temperature in C
 # parameters: warning (ARG1) and critical (ARG2) temperature in Celcius
 define command {
         command_name    check_temperature
-        command_line    [install_path]/plugins/check_temperature -w $ARG1$ -c $ARG2$
+        command_line    [install_path]/plugins/check_temperature -w $ARG1$ -c $ARG2$ w1_ds18b20
 }
 
 # 'check_ftemperature' command definition to monitor a single temperature in F
 # parameters: warning (ARG1) and critical (ARG2) temperature in Farenheit
 define command {
         command_name    check_ftemperature
-        command_line    [install_path]/plugins/check_temperature -F -w $ARG1$ -c $ARG2$
+        command_line    [install_path]/plugins/check_temperature -F -w $ARG1$ -c $ARG2$ w1_ds18b20
 }
 
 # 'check_temperature_sensor' command definition to monitor a single temperature in C
 # parameters: sensor serial (ARG1), warning (ARG2) and critical (ARG3) temperature in Celcius
 define command {
         command_name    check_temperature_sensor
-        command_line    [install_path]/plugins/check_temperature -s $ARG1$ -w $ARG2$ -c $ARG3$
+        command_line    [install_path]/plugins/check_temperature -w $ARG2$ -c $ARG3$ w1_ds18b20 -s $ARG1$
 }
 
 # 'check_ftemperature_sensor' command definition to monitor a single temperature in F
 # parameters: sensor serial (ARG1), warning (ARG2) and critical (ARG3) temperature in Farenheit
 define command {
         command_name    check_ftemperature_sensor
-        command_line    [install_path]/plugins/check_temperature -F -s $ARG1$ -w $ARG2$ -c $ARG3$
+        command_line    [install_path]/plugins/check_temperature -F -w $ARG2$ -c $ARG3$ w1_ds18b20 -s $ARG1$
 }
 
 ~~~
@@ -290,6 +305,14 @@ Make sure to replace `[install_path]/plugins` with the location of the script.
 To use the it define a service check like below:
 
 ~~~
+# check RaspberryPi CPU temperature in Celcius
+define service {
+        host                   hostname.mydomain.tld
+        service_description    CPU Temperature
+        check_command          check_cpu_temperature!55!75
+        use                    generic-service
+}
+
 # check temperature in Celcius using a DS18B20 sensor connected to a RaspberryPi
 define service {
         host                   hostname.mydomain.tld
@@ -298,7 +321,6 @@ define service {
         use                    generic-service
 }
 
-
 # check temperature with DS18B20 sensor 0000a31ea3de connected to a RaspberryPi
 define service {
         host                   hostname.mydomain.tld
@@ -340,3 +362,4 @@ General Public License for more details.
 
 You should have received a copy of the GNU General Public License along with
 this program.  If not, download it from <http://www.gnu.org/licenses/>.
+