Initial commit

.digitemprc

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+TTY /dev/ttyUSB0
+READ_TIME 1000
+LOG_TYPE 1
+LOG_FORMAT "%b %d %H:%M:%S Sensor %s C: %.2C F: %.2F"
+CNT_FORMAT "%b %d %H:%M:%S Sensor %s #%n %C"
+HUM_FORMAT "%b %d %H:%M:%S Sensor %s C: %.2C F: %.2F H: %h%%"
+SENSORS 3
+ROM 0 0x10 0x7E 0x66 0xD0 0x02 0x08 0x00 0xC5 
+ROM 1 0x28 0xFF 0xEB 0xF0 0x50 0x17 0x04 0x0B 
+ROM 2 0x28 0xFF 0xDB 0xD7 0x50 0x17 0x04 0x79 

.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/1wire/output
+
+function print_usage () {
+    echo ""
+    echo "Usage:"
+    echo ""
+    echo "  parseOutput <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
+

post2mqtt.py

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+#!/usr/bin/python
+
+import sys, string, time, atexit
+
+import paho.mqtt.client as mqtt
+
+# ---- Configuration START ----
+
+topic = 'neues-haus/keller/tele/werkstatt/'
+mqttBroker = '192.168.0.11'
+mqttPort = 1883
+mqttuser = 'werkstatt-pi'
+mqttpasswort = 'h#st0$HYWq1Z2*'
+valuesFile = '/opt/1wire/output'
+maxDataAge = 300  # [s]
+minTemp = -10.0     # [°C], for simple sanity check
+maxTemp = 35.0      # [°C], for simple sanity check
+debug = True
+
+# ---- Configuration END  ----
+
+# MQTT init
+def on_connect(client, userdata, flags, rc, properties):
+    if rc != 0:
+        print("Connection to MQTT broker failed with rc = ", rc)
+
+try:
+    client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2, 'werkstatt-pi')
+    client.username_pw_set(mqttuser, mqttpasswort)
+    client.on_connect = on_connect
+    client.connect(mqttBroker, port=mqttPort)
+    client.loop_start()
+except:
+    print('Connection to MQTT broker failed')
+    sys.exit()
+
+# Function definitions
+
+def exit_handler():
+    client.publish(topic + 'LWT', 'Offline', 0, True)
+
+def getValues():
+    values = {}
+    with open(valuesFile,"r") as f:
+        for line in f:
+            if debug:
+                print('line = ' + line)
+
+            splitted = line.split('=')
+            if len(splitted) == 2:
+                values[splitted[0].strip()] = splitted[1].strip()
+
+        return values
+
+def publishMetrics():
+    payload = '{ "timestamp": "' + values['Timestamp']  + '"'
+    for key in ['LuftTemp', 'WasserTemp', 'BodenTemp']:
+        if key in values and float(values[key]) >= minTemp and float(values[key]) <= maxTemp:
+            payload = payload + ', "' + key + '": "' + values[key] + '"'
+
+        if debug:
+            print(key + ' = ' + values[key] + ' °C')
+
+    payload = payload + ' }'
+
+    if debug:
+        print('payload = ' + payload)
+
+    client.publish(topic + 'SENSOR', payload)
+
+
+# Main
+
+client.publish(topic + 'LWT', 'Online', 0, True)
+atexit.register(exit_handler)
+
+while(1):
+    values = getValues()
+
+    if not 'Timestamp' in values:
+        continue
+
+    dataAge = int(time.time() - int(values['Timestamp']))
+
+    if debug:
+        print('Data age = ' + str(dataAge) + ' seconds')
+
+    if dataAge > maxDataAge:
+        continue
+
+    publishMetrics()
+
+    time.sleep(60)

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=2
+
+# 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="/opt/1wire/.digitemprc"
+
+# Command to use for reading the sensors
+CMD="sudo /usr/bin/digitemp_DS9097"
+CMDOPTS=" -q -s $USETTY  -c $DIGITEMPCONF"
+
+# Define sensors that should be queried
+# Format: [<Label>]=<Id>
+declare -A SENSORS=( [0]=LuftTemp [1]=WasserTemp [2]=BodenTemp )
+
+# Location where the readings should be stored
+OUTFILE="output"
+RESULT=""
+
+#
+# no configuration/changes should be necessary below this line
+#
+
+cd "$(dirname "$0")";
+touch "$OUTFILE" 2> /dev/null
+
+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 $DELAY
+            read_sensor
+            check_output
+        else
+            RESULT="$RESULT${SENSORS[$SENSORID]}=Error\n"
+        fi
+    fi
+}
+
+function store_result () {
+    RESULT="$RESULT${SENSORS[$SENSORID]}=${VALUE}\n"
+}
+
+function write_to_file () {
+    echo "Timestamp="`date +%s` > "$OUTFILE"
+
+    echo -e "$RESULT" >> "$OUTFILE"
+}
+
+for SENSORID in  "${!SENSORS[@]}"
+do
+    CNT=0
+    read_sensor
+    check_output
+    store_result
+    sleep $DELAY
+done
+write_to_file

test.py

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+valuesFile = 'output'
+values = {}
+
+with open(valuesFile,"r") as f:
+    for line in f:
+        splitted = line.split('=')
+        if len(splitted) == 2:
+            values[splitted[0].strip()] = splitted[1].strip()
+
+print(values)