#!/bin/bash
# This is for Bob, KB8ZXE.  For adding intenet linking to a repeater
# that has a single port controller.  Essentially local receiver audio
# is streamed to itself, back out the transmitter.  While enabling
# the ability to receive/transmit remote streams.  
# Instead of external hardware audio mixing we let linux be the mixer.
# 
# This uses some X86 binaries for IRLP. (cosstate and key/ unkey)
# ftp.irlp.net/pub/irlpv2.0
# IRLP uses parallel port pin 3 for PTT and pin 11 for COS
#
# The IRLP imike and ispeaker keying and unkey do not work in duplex, so
# we use speak freely (sfmike and sfspeaker) 
# http://speak-freely.sourceforge.net
# And do the keying by this looped script
#
# Set inital COS state
LAST="0"
# Poll the cosstate over and over, and set a state flag/variable
while true
 do 
   if ./cosstate
   then
     STATE="0" 
   else
     STATE="1"
   fi
##################################
# Check to see if the state has changed as we only want to perform
# funtions on its change
#
 if [ $STATE -ne $LAST ]; then
 echo "COS state is:" $STATE
 NEW=$STATE
## COS is active
if [ $NEW = 1 ]; then
echo "KEY"
# Key and begin streaming
./key
./sfmike -A -N -P127.0.0.1 &
fi
## COS is inactive
if [ $NEW = 0 ]; then
echo "UNKEY"
# Unkey and end the stream
./unkey
killall -TERM sfmike > /dev/null 2&>1
fi

fi 
#
LAST=$STATE
sleep .1
done