# Script to allow switching of DMR network using a hardware switch
# connected to a gpio pin
# by Roger Clark VK3KYY / G4KYF

# Before using this script you need to make backup copies of your  DMR Marc
# and Brandmeister mmdvmhost setting files into /home/pi-star/configs 
# the script assumes the files are called marc and bm
#
# You need to make the configs folder 
# e.g. 
# rpi-rw
# mkdir /home/pistar/configs
#
#
# To create these files. Use the Pi-Star configuration screen to switch to 
# DMR Marc, then copy /etc/mmdvmhost to /home/pi
# cp /etc/mmdvmhost /home/pistar/configs/marc
# Then reconfigure to Brandmeister and save that config
# cp /etc/mmdvmhost /home/pistar/configs/bm


#--------- Script code starts here ----------------------------------------

gpio mode 7 in
# Set the lastVal to a non binary value to force the script to copy the
# config set by the switch when the script starts, in case the switch
# was changed when the script was not running, e.g. if the Raspberry Pi was
# not powered up etc
lastVal=-1

#Loop indefinitely
while :
do
	b=$(gpio read 7)
	if [ $b != $lastVal ]
	then
		lastVal=$b
		#need to mount the file system as read write 
		#as it defaults to read only

		mount -o remount,rw /
		if [ $b -eq 1 ]
		then
        		echo "Brandmeister mode"
			cp /home/pi-star/configs/bm /etc/mmdvmhost
		else
        		echo "DMR MARC mode"
			cp /home/pi-star/configs/marc /etc/mmdvmhost
		fi
	mount -o remount,ro /
	systemctl restart mmdvmhost.service
	fi
	sleep 1
done