#!/bin/bash
#
# Simple Script to remove all reatined messages for a homie device
# Works great for me to get rid of devices in MQTT, which are not active anymore.
# Maybe it is helpful for someone else...

echo
echo "Clearing for device $1 all messages, last clean will block kill with Ctrl+C when nothing happens anymore."
echo
#mosquitto_sub -v -h 10.0.2.2 -t "homie/$1/#" -C $2
echo "STARTING :: Checking for valid topics one after the other...."

MAX_TOPICS_TO_CHECK=100

for c in `seq 0 $MAX_TOPICS_TO_CHECK`
    do
    echo "  $c Checking for Topic ...."
    for i in `mosquitto_sub -v -h 10.0.2.2 -t "homie/$1/#" -C 1|cut -d' ' -f1`
        do
            # echo "mosquitto_pub -h 10.0.2.2 -r -n -t \"`echo $i | sed s#'\\$'#'\\\\\\\$'#g`\""
            echo "    $i >> sending empty payload to topic with retained flag"
            mosquitto_pub -h 10.0.2.2 -r -n -t "`echo $i | sed s#'\\$'#'\\\$'#g`"
        done
done