Initial commit

eas.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+## Requires: minimodem sox
+### sudo apt install -y minimodem sox
+
+# check for dependencies
+hash minimodem 2>/dev/null || { echo >&2 "I require minimodem but it's not installed.  Aborting."; exit 1; }
+hash play 2>/dev/null || { echo >&2 "I require sox but it's not installed.  Aborting."; exit 1; }
+
+
+## For valid Originator Codes, Event Codes, and Location Codes see 47 CFR § 11.31
+## https://www.law.cornell.edu/cfr/text/47/11.31
+PREAMBLE='\xAB\xAB\xAB\xAB\xAB\xAB\xAB\xAB\xAB\xAB\xAB\xAB\xAB\xAB\xAB\xAB'
+ORIGINATOR=PEP
+EVENT=EAN
+LOCATION=000000
+DURATION=2400
+PARTICIPANT_ID=00000000
+# Go time is "now"
+STARTTIME=$(TZ=UTC date +%j%H%M)
+
+
+echo -n -e "${PREAMBLE}ZCZC-${ORIGINATOR}-${EVENT} + ${DURATION}-${STARTTIME}-${PARTICIPANT_ID}-" | minimodem --tx same
+sleep 1
+echo -n -e "${PREAMBLE}ZCZC-${ORIGINATOR}-${EVENT} + ${DURATION}p${STARTTIME}-${PARTICIPANT_ID}-" | minimodem --tx same
+sleep 1
+echo -n -e "${PREAMBLE}ZCZC-${ORIGINATOR}-${EVENT} + ${DURATION}-${STARTTIME}-${PARTICIPANT_ID}-" | minimodem --tx same
+sleep 1
+
+
+# 8-25 second attention signal  835+960 Hz
+play -n synth 10 sin 835 sin 960 remix -
+sleep 1
+
+# transmission of audio, video or text message
+echo -n -e "Some message should go here" | minimodem --tx same
+sleep 1
+
+for i in {1..3}; do
+    echo -n -e "${PREAMBLE}NNNN" | minimodem --tx same
+    sleep 1
+done
+