cmd.sh

#!/bin/ash
# MQTT SETTINGS
host="<mqtt_broker_url>"
user="<user>"
password="<password>"
port=1883
topic="<topic>"

#ONION OMEGA2 GPIO PID SETTING
io_pid=0

gpioctl dirout $io_pid > /dev/null
p="backpipe"

ctrl_c() {
  echo "Cleaning up..."
  pid=$(cat pidfile)
  rm -f $p;rm cmds;rm pidfile;kill $pid 2>/dev/null
  if [[ "$?" -eq "0" ]];
  then
     echo "Exit success";exit 0
  else
     exit 1
  fi
}


listen(){
([ ! -p "$p" ]) && mkfifo $p
(mosquitto_sub -h $host -u $user -P $password -p $port -t $topic >$p) &
echo "$!" > pidfile
while read line <$p
do
  echo $line > cmds
  if grep -q "toggle" cmds; then
    gpioctl dirout-high 0 > /dev/null && sleep 1 && gpioctl dirout-low 0 > /dev/null
  fi
done
}

trap ctrl_c INT
listen