initial upload

.gitignore

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+output

parseOutput

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+#!/bin/bash
+
+#
+# Copyright (c) 2018 leopold@shdx.org
+# Author: Der_Leopold
+#
+# This script simply parses the text file created by readSensor and
+# prints the requested value. It is supposed to be called by the Zabbix
+# agent.
+# To prevent processing of stale data, it compares the timestamp from
+# the file to the current one and returns an error if the difference is
+# too big.
+#
+
+# Maximum data age in seconds. If the data is older, print an error and exit.
+MAXAGE=300
+
+# File to read the sensor data from
+DATAFILE=/opt/Zabbix-1wire/output
+
+function print_usage () {
+    echo ""
+    echo "Usage:"
+    echo ""
+    echo "  readOutput <LuftTemp|Wassertemp|Bodentemp>"
+    echo ""
+}
+
+function parse_datafile () {
+#    REGEX="^(\w+)=(\d+\.*\d*)$"  # should work but does not?
+    REGEX="^(\w+)=(.*)$"
+    while read -r LINE; do
+        if [[ $LINE =~ $REGEX ]]; then
+	    KEY=${BASH_REMATCH[1]}
+	    VALUE=${BASH_REMATCH[2]}
+            case $KEY in
+                "Timestamp")
+		    THRESHOLD=$(( $VALUE + $MAXAGE ))
+		    TS=$(date +"%s")
+		    if (( $TS <= $THRESHOLD )); then
+		        TSVALID=1
+		    fi
+                    ;;
+                "LuftTemp")
+                    if [ $PARAM == "LuftTemp" ]; then
+		        RESULT=$VALUE
+		    fi
+		    ;;
+                "WasserTemp")
+		    if [ $PARAM == "WasserTemp" ]; then
+                        RESULT=$VALUE
+                    fi
+		    ;;
+                "BodenTemp")
+                    if [ $PARAM == "BodenTemp" ]; then
+                        RESULT=$VALUE
+                    fi
+                    ;;
+            esac
+        fi
+    done < "$DATAFILE"
+}
+
+PARAM="$1"
+
+if [[ ( ! $# -eq 1 ) || ( $PARAM != "LuftTemp" && $PARAM != "WasserTemp" && $PARAM != "BodenTemp" ) ]]; then
+    print_usage
+    exit 1
+fi
+
+if [ ! -r $DATAFILE ]; then
+    echo "Error: cannot read data file"
+    exit 1
+else
+    TSVALID=0
+    parse_datafile
+fi
+
+if [ $TSVALID -eq 0 ]; then
+    echo "Error: Data file contains old or invalid data"
+    exit 1
+else
+    echo "$RESULT"
+    exit 0
+fi
+

readSensor

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+#!/bin/bash
+
+#
+# Copyright (c) 2018 leopold@shdx.org
+# Author: Der_Leopold
+#
+# This script tries to read sensor values from a 1wire bus and writes the results
+# and a timestamp to a file. It is intended to be executed periodically, for
+# example via crontab.
+#
+
+# Retry up to n times if the reading fails
+RETRY=3
+
+# Number of seconds to wait between retries
+DELAY=3
+
+# Specify the temperature range where you expect the sensors will be operating
+# This is simply used as a safeguard to detect implausible sensor readings
+MINTEMP=-30
+MAXTEMP=40
+
+# Interface that is connected to the 1wire bus
+USETTY=/dev/ttyUSB0
+
+# Location of the digittemp config file with data about the sensors
+DIGITEMPCONF="/etc/digitemp.conf"
+
+# Command to use for reading the sensors
+CMD="sudo /usr/bin/digitemp_DS9097"
+CMDOPTS=" -q -s $USETTY  -c $DIGITEMPCONF"
+
+# Define sensors that should be queried
+# Format: [<Label>]=<Id>
+declare -A SENSORS=( [0]=LuftTemp [1]=WasserTemp [2]=BodenTemp )
+
+# Location where the readings should be stored
+OUTFILE="output"
+
+
+#
+# no configuration/changes should be necessary below this line
+#
+
+cd "$(dirname "$0")";
+touch "$OUTFILE" 2> /dev/null
+echo "Timestamp="`date +%s` > "$OUTFILE"
+
+if [ ! -w $OUTFILE ]; then
+    echo "Error: output file '$OUTFILE' not writeable"
+    exit 1
+fi
+
+function read_sensor () {
+    OUTPUT=`$CMD $CMDOPTS -t $SENSORID`
+    VALUE=`echo "$OUTPUT" | awk -F "C: " '{print $2}' | awk -F " F:" '{print $1}'`
+    CNT=$(($CNT+1))
+}
+
+function check_output () {
+    if [[ $OUTPUT =~ fail ]] || [[ $OUTPUT =~ owAcquire ]] || [ ${VALUE%.*} -lt $MINTEMP ] || [ ${VALUE%.*} -gt $MAXTEMP ]; then
+        if [ $CNT -le $RETRY ]; then
+            sleep $DELAY
+            read_sensor
+            check_output
+        else
+            echo "${SENSORS[$SENSORID]}=Error" > "$OUTFILE"
+        fi
+    fi
+}
+
+function write_results () {
+    echo "${SENSORS[$SENSORID]}=${VALUE}" >> "$OUTFILE"
+}
+
+for SENSORID in  "${!SENSORS[@]}"
+do
+    CNT=0
+    read_sensor
+    check_output
+    write_results
+    sleep $DELAY
+done

userparameter_1wire.conf

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+UserParameter=1wire.luft_temp[*],/opt/Zabbix-1wire/parseOutput LuftTemp
+UserParameter=1wire.wasser_temp[*],/opt/Zabbix-1wire/parseOutput WasserTemp
+UserParameter=1wire.boden_temp[*],/opt/Zabbix-1wire/parseOutput BodenTemp