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