====== Viri Warning Lamp ======

The Viri Warning Lamp has all the electronics built in by now and comes with a nice Raspberry Pi GPIO plug:

https://c3voc.de/gallery/misc/voc-light/

===== GPIO Preparation =====

The yellow warning lamp runs on **GPIO14**:

<code bash>
root@raspberry-pi:~# echo "14">/sys/class/gpio/export
root@raspberry-pi:~# echo "out">/sys/class/gpio/gpio14/direction
</code>

ggF. ''voc'' user in ''gpio'' Gruppe setzen.

<code bash>
root@raspberry-pi:~# adduser voc gpio
</code>

===== Automatic Trigger via MQTT =====

Prerequisites: AnyEvent and AnyEvent::MQTT:
<code bash>
sudo apt-get install libanyevent-perl liblocal-lib-perl cpanminus

eval $(perl -Mlocal::lib)
cpanm AnyEvent::MQTT

# get VOC mqtt tools
git clone git@c3voc.de:mqtt
</code>

Running:
<code bash>
cd mqtt/shell

# reinstate local::lib if not already present in the current environment
eval $(perl -Mlocal::lib)

screen -S bot perl bot.pl
</code>
Es kann sein, dass perl z.B. Alert.pm nicht findet, Suchpfade dafür kann man folgendermaßen hinzufügen:
<code bash>
export PERL5LIB=[pfad]
</code>

Zum Filtern der Meldungen ''bot.pl'' anschauen und editieren.

===== Manual Trigger =====

<code bash>
root@raspberry-pi:~# echo "1">/sys/class/gpio/gpio14/value 
root@raspberry-pi:~# echo "0">/sys/class/gpio/gpio14/value 
root@raspberry-pi:~# echo "1">/sys/class/gpio/gpio14/value 
root@raspberry-pi:~# echo "0">/sys/class/gpio/gpio14/value 
</code>

Oder ''shell/alert.pl'' / ''shell/alert.sh''

===== Socket Trigger =====

**blink.sh**
<code bash>
while [ true ]
do
  sleep 0.3
  echo $1
  `nc $1 9191` || { continue; }
  echo blink
  echo "1">/sys/class/gpio/gpio14/value
  sleep 1.5
  echo "0">/sys/class/gpio/gpio14/value
done
</code>

**On the remote host**
<code bash>
socat -du TCP-LISTEN:9191,fork TCP-LISTEN:9192,range=127.0.0.1/32,reuseaddr
</code>

**On the Pi**
<code bash>
echo "14">/sys/class/gpio/export
echo "out">/sys/class/gpio/gpio14/direction 
./blink.sh foobarhost.c3voc.de
</code>

** To trigger on the remote Host **
<code bash>
nc -z localhost 9192
</code>