Hacky mqtt2opensensemap bash script for http://opensensemap.org Subscribes to MQTT Topics and publishes data to opensensemap.

mqtt2sense.sh

#!/bin/bash

#####################################################################################
#  mqtt2sense - Publish mqtt-topics to opensensemap.org or compatible server
#  Toke 2015
#  Public Domain - no rights reserved
#####################################################################################

CURL="/usr/bin/curl"
MOSQUITTO="/usr/bin/mosquitto_sub"

MQTT_HOST="mqtt.server.de"
MQTT_PORT="1883"

BOX_ID="1234"

declare -A SENSORMAP

### Format: SENSORMAP["MQTT-TOPIC"]="OPENSENSEMAP SENSOR KEY"

SENSORMAP["sensors/place/1234/temp"]="1234"
SENSORMAP["sensors/place/5678/temp"]="5678"
SENSORMAP["sensors/place/9abc/pressure"]="9abc"

BASE_URL="http://opensensemap.org:8000/boxes/"

#####################################################################################

function publish {
        BOX_ID="$1"
        SENSOR_ID="$2"
        DATA="$3"

        URL="${BASE_URL}/${BOX_ID}/${SENSOR_ID}"
        JSON='{"value":'$DATA'}'
        $CURL -s -X POST --header "Content-Type: application/json" -d "$JSON" ${URL}
}

TOPICS="${!SENSORMAP[@]}"
SUBSCRIBE=$(for t in $TOPICS ; do echo "-t $t" ; done)
echo "Subscribe to $TOPICS"

$MOSQUITTO -h "${MQTT_HOST}" -p "${MQTT_PORT}" -v $SUBSCRIBE | while read line 
do
        KEY=$(echo "$line" | awk '{ print $1 }')
        VAL=$(echo "$line" | awk '{ print $2 }')
        SENSOR_ID="${SENSORMAP[$KEY]}"

        if [ ! -z "${SENSOR_ID}" ] ; then
                echo -n -e "\nSend $VAL to $SENSOR_ID:\n\t"

                publish "$BOX_ID" "${SENSOR_ID}" "$VAL"
        fi
done