A dual band aprs digipeater with enhanced telemetry capabilities.
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#!/bin/bash
##################################################################################
# Send an APRS message consrructed from the given parameters. #
# #
# (C)2021 M.T. Konstapel https://meezenest.nl/mees #
# #
# This file is part of PE1RXF-APRS-server. #
# #
# NOTE: the ax25 utility 'beacon' has a bug: the first few times it is called #
# the send string ends with some random characters. After these first few #
# times it all comes good and the utility works fine. #
# #
# PE1RXF-APRS-server is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# PE1RXF-APRS-server is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with PE1RXF-APRS-server If not, see <https://www.gnu.org/licenses/>. #
# #
##################################################################################
source /home/marcel/ham/aprs_utils/config.shlib; # load the config library functions
ConfigFile=/home/marcel/ham/aprs_utils/pe1rxf-aprs-server.cfg
# Directory where APRS messages are stored
APRS_RECEIVED_MESSAGES_DIR=/home/marcel/ham/aprs_utils/aprs_log/
MESSAGE_FILE=aprs_send_messages.log
############################################################
# Help #
############################################################
Help()
{
# Display Help
echo "Send APRS message."
echo
echo "Syntax: set_beacon.sh [-i <interface>|-c <call>|-p <path>|-m <message>]"
echo "Options:"
echo "-i AX.25 interface (ax0, ax1 or ax2)"
echo "-c Destination call"
echo "-p Path: 0=none, WIDE2-1, WIDE2-2, WIDE3-3 or call of digipeater"
echo "-m Message to send."
echo
}
############################################################
############################################################
# Main program #
############################################################
############################################################
# Set variables
Interface="0"
Call="0"
Path="0"
Message=""
############################################################
# Process the input options. #
############################################################
# Get the options
while getopts i:c:p:m: flag; do
case "${flag}" in
i) # Interface
Interface=${OPTARG};;
c) # Destination Call
Call=${OPTARG};;
p) # Path
Path=${OPTARG};;
m) # Message
Message=${OPTARG};;
\?) # Invalid option
echo "Syntax error!"
Help
exit;;
esac
done
CURRENT_DATE_TIME=$(date +"%Y-%m-%d %H:%M:%S")
if [ "$Interface" == "ax0" ]; then
# Log message
echo "$CURRENT_DATE_TIME,ax0,$Call,APRX29,\"$Message\"" >> $APRS_RECEIVED_MESSAGES_DIR$MESSAGE_FILE
# if call is less than 9 characters, add spaces at the end (according to the APRS protocol)
printf -v Call %-9.9s "$Call"
if [ "$Path" == "0" ]; then
APRS_FRAME="PE1RXF-1>APRX29::$Call:$Message"
else
APRS_FRAME="PE1RXF-1>APRX29,$Path::$Call:$Message"
fi
AX0_APRS_TRANSMIT_DIR="$(config_get ax0_transmit_directory $ConfigFile)"
echo "$APRS_FRAME" > "$AX0_APRS_TRANSMIT_DIR"message.msg
#echo "$APRS_FRAME $AX0_APRS_TRANSMIT_DIR"
elif [ "$Interface" == "ax1" ]; then
# Log message
echo "$CURRENT_DATE_TIME,ax1,$Call,APRX29,\"$Message\"" >> $APRS_RECEIVED_MESSAGES_DIR$MESSAGE_FILE
# if call is less than 9 characters, add spaces at the end (according to the APRS protocol)
printf -v Call %-9.9s "$Call"
if [ "$Path" == "0" ]; then
APRS_FRAME="PE1RXF-2>APRX29::$Call:$Message"
args[0]=-d
args[1]="APRX29"
args[2]=-s
args[3]=ax1
args[4]=":$Call:$Message"
else
APRS_FRAME="PE1RXF-2>APRX29,$Path::$Call:$Message"
args[0]=-d
args[1]="APRX29 $Path"
args[2]=-s
args[3]=ax1
args[4]=":$Call:$Message"
fi
#echo "$APRS_FRAME"
#"$APRS_CMD" > tmp.tmp
/usr/sbin/beacon "${args[@]}"
elif [ "$Interface" == "ax2" ]; then
# Log message
echo "$CURRENT_DATE_TIME,ax2,$Call,APRX29,\"$Message\"" >> $APRS_RECEIVED_MESSAGES_DIR$MESSAGE_FILE
# if call is less than 9 characters, add spaces at the end (according to the APRS protocol)
printf -v Call %-9.9s "$Call"
if [ "$Path" == "0" ]; then
APRS_FRAME="PE1RXF-3>APRX29::$Call:$Message"
args[0]=-d
args[1]="APRX29"
args[2]=-s
args[3]=ax2
args[4]=":$Call:$Message"
else
APRS_FRAME="PE1RXF-3>APRX29,$Path::$Call:$Message"
args[0]=-d
args[1]="APRX29 $Path"
args[2]=-s
args[3]=ax2
args[4]=":$Call:$Message"
fi
#echo "$APRS_FRAME"
#"$APRS_CMD" > tmp.tmp
/usr/sbin/beacon "${args[@]}"
fi