initial add of systemd for rpitx and sh

rpitx.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+echo -e "\nrpitx for CubeSatSim at 434.9 MHz\n"
+
+	if [ "$1" = "a" ]; then
+    		echo "Mode is continuous AFSK"
+    		sleep infinity 
+	elif [ "$1" = "b" ]; then
+   		echo "Tx is continuous BPSK"
+		sudo nc -l 8080 | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | while true; do sudo timeout -k 1 60m /home/pi/rpitx/rpitx -i- -m RF -f 434.897e3; done
+	else 
+    		echo "Tx is continuous FSK"
+		sudo nc -l 8080 | csdr convert_i16_f | csdr fir_interpolate_cc 2 | csdr dsb_fc | csdr bandpass_fir_fft_cc 0.002 0.06 0.01 | csdr fastagc_ff | while true; do sudo timeout -k 1 60m /home/pi/rpitx/sendiq -i /dev/stdin -s 96000 -f 434.8945e6 -t float 2>&1; done
+	fi

systemd/rpitx.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=CubeSatSim rpitx service
+
+[Service]
+TimeoutStopSec=5
+EnvironmentFile=/home/pi/CubeSatSim/.mode
+ExecStart=/home/pi/CubeSatSim/rpitx.sh $ARG1
+WorkingDirectory=/home/pi/CubeSatSim
+StandardOutput=inherit
+StandardError=inherit
+Restart=always
+User=root
+
+[Install]
+WantedBy=default.target