LAN home events - sending and listenting for UDP broadcasts

example hook script

# Example broadcast command triggered in my case by the RPi doorbell
echo "doorbell" | socat - UDP-DATAGRAM:255.255.255.255:12345,broadcast

service.sh

# Script to listen for UDP broadcasts from doorbell computer
# and play a sound on doorbell press or pir motion
# Installed on the X96-mini TV box that we use as a camera monitor
# under /data/mwvent/soundPlayer/service.sh

# required socat binary ( found online static arm build ) to be placed
# in /system/bin/socat

# The script is called at boot by hijacking an existing boot script
# in this case I added the following line to /system/bin/preinstall.sh
# /data/mwvent/soundPlayer/service.sh &

socat -u udp-recv:12345 - | while read LN; do
        echo "Got $LN"
        case "$LN" in    
                doorbell)                                               
                        tinyplay "/data/mwvent/soundPlayer/doorbell.wav"
                        ;;
                pir_door)                                             
                        tinyplay "/data/mwvent/soundPlayer/motion.wav"
                        ;;
        esac
done