#!/bin/bash
#
# receiver1udp (c) 2023 Jacek Lipkowski SQ5BPF <sq5bpf@lipkowski.org>
#
# This is an example how to get I/Q data via udp packets,
# feed them to a qpsk demodulator, and feed the result to tetra-rx
#
# Originally this was developed to work with the osmo-tetra-sq5bpf tree
# but will work with original osmo-tetra too
#
#
# To use with an rtl-sdr dongle:
#
# - run the demod/telive_1ch_simple_gr310_udp.py (you can also use the telive_1ch_simple_gr310_udp.grc in gnuradio-companion)
#
# - run ./receiver1udp
#
# - enter the frequency in the receiver window, set the ppm (frequency correction) and the gain
#


if [ "$1" ]; then
	RXID=$1
else
	RXID=1
fi


# you can also set GR_VERSION yourself outside of this script --sq5bpf
[ "$GR_VERSION" ] || GR_VERSION=`gnuradio-config-info -v|cut -d . -f 1-2|tr -d v`
case $GR_VERSION in
	3.6)
		GR_DIR=gnuradio-3.6
		PYT=2
		;;
	3.7)
		GR_DIR=gnuradio-3.7
		PYT=2
		;;
	3.10)
		GR_DIR=gnuradio-3.10
		PYT=3
		;;
	*)
		echo "Unsupported gnuradio version $GR_VERSION"
		exit 1
		;;
esac

UDP_PORT=42001


ulimit -c unlimited

#tetra-rx args: -a turns on pseudo-afc , -i uses an internal float_t_bits
# -r turns on fragment reassembly, -s tries to dump unknown SDS protocols as text
#
#if you have problems with the receiver, then try to remove -a

case "$PYT" in
	2)
		socat -b 4096 UDP-RECV:${UDP_PORT} STDOUT | demod/simdemod2.py -o /dev/stdout -i /dev/stdin |  ./float_to_bits -a /dev/stdin /dev/stdout | ./tetra-rx  /dev/stdin
		;;
	3)
		socat -b 4096 UDP-RECV:${UDP_PORT} STDOUT | demod/simdemod3.py | ./tetra-rx   /dev/stdin
		;;
	*)
		echo "Dont know how to handle pythin version [$PYT]"
		exit 1
esac