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218 lines
9.4 KiB
218 lines
9.4 KiB
3 years ago
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#!/bin/bash
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##################################################################################
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# Background process started by the initializing script start_aprs_server.sh #
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# #
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# It processes all incomming messages for PE1RXF and sends acknowledges when #
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# if asked for (via kissutil for ax0 and beacon for ax1. It also prosesses the #
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# special telemetry messages from PE1RXF devices. #
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# #
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# (C)2021 M.T. Konstapel https://meezenest.nl/mees #
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# #
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# This file is part of PE1RXF-APRS-server. #
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# #
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# PE1RXF-APRS-server is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# PE1RXF-APRS-server is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with PE1RXF-APRS-server If not, see <https://www.gnu.org/licenses/>. #
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# #
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##################################################################################
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# Filters out all APRS messages to PE1RXF-1 and saves these to file.
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# Generate and send acknowledge message when incomming message ask for it.
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# Also, reads APRS message and when it is telemetry converts it to a format readeble by gnuplot
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#
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# The script aprs_utils.sh starts a filters means of tail | grep on the log file of aprx.
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# The output of this command goes to this script via stdin. This script reads this line by line
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# and sends an acknowledgement to the stations asking for one. This is done via kissutil, which
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# is also started the script aprs_utils.sh
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# Direectory where kissutils expect files to send
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APRS_SEND_MESSAGE_DIRECTORY=/home/marcel/ham/aprs_utils/aprs_files_to_transmit/
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# Directory where APRS messages are stored
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APRS_RECEIVED_MESSAGES_DIR=/home/marcel/ham/aprs_utils/aprs_log/
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MESSAGE_FILE=aprs_received_messages.log
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# Get current date YYYY-MM-DD
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#CURRENT_DATE=$(date +"%Y-%m-%d")
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#Read file line by line and send acknowledge if needed
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while read LINE
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do
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#################
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# Section: filter out APRS messages and generate acknowledge if needed
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#################
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# Get current date YYYY-MM-DD (do this every time, because a day may already have passed)
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CURRENT_DATE=$(date +"%Y-%m-%d")
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CURRENT_DATE_TIME=$(date +"%Y-%m-%d %H:%M:%S")
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# figure out who sent the message
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# Check channel 1 (internal radio)
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CALL="$(grep -o -P "(?<=PE1RXF-1 d \*).+?\>"<<<$LINE)"
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PORT="ax0"
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# If call is empty, frame not from channel 1, maybe from channel 2?
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if [ -z $CALL ]; then
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CALL="$(grep -o -P "(?<=PE1RXF-2 d \*).+?\>"<<<$LINE)"
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PORT="ax1"
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fi
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# Lets do something with the message from channel 1 or 2
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if [[ $CALL ]]; then
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# Remove last character from string
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CALL=${CALL::-1}
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ACKNOWLEDGE_NUMBER="$(grep -o -P '(?<={).*'<<<$LINE)"
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#Write messages to file with name "YYYY-MM-DD_messages_from_NOCALL.log (append)
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#echo "$LINE" >> "$APRS_RECEIVED_MESSAGES_DIR""$CURRENT_DATE""_messages_from_""$CALL"".log"
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# Get full path of message
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if [ $PORT == "ax0" ]; then
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FULL_PATH="$(grep -o -P '(?<=PE1RXF-1 d \*).+?:'<<<$LINE)"
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else
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FULL_PATH="$(grep -o -P '(?<=PE1RXF-2 d \*).+?:'<<<$LINE)"
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fi
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FULL_PATH="$(grep -o -P '(?<=\>).*'<<<$FULL_PATH)"
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# Remove last character from string
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FULL_PATH=${FULL_PATH::-1}
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# Messages direct from sender do not contain a '*' in the path
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DIRECT="$(grep '*' <<<$FULL_PATH)"
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if [ -z $DIRECT ]; then
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DIRECT="true"
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else
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unset DIRECT
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fi
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# First call in path is destination
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DESTINATION="$(awk -F "," '{ print $1} ' <<<$FULL_PATH)"
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# get the message
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MESSAGE="$(grep -o -P '(?<=::).*'<<<$LINE)"
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MESSAGE="$(grep -o -P '(?<=:).*'<<<$MESSAGE)"
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# Write message to file
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echo "$CURRENT_DATE_TIME"",""$PORT"",""$CALL"",""$DESTINATION",\"$MESSAGE\" >> "$APRS_RECEIVED_MESSAGES_DIR""$MESSAGE_FILE"
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#Send incomming message as email
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#echo "$LINE" | /home/marcel/ham/aprs_utils/send_aprs_message_to_email.sh
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#Generate acknowledge frame and put in in de directory where kissutil can find (ax0) it or (for channel ax1) send it via beacon
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if [[ $ACKNOWLEDGE_NUMBER ]]; then
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# if call is less than 9 characters, add spaces at the end (according to the APRS protocol)
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printf -v FORMATTED_CALL %-9.9s "$CALL"
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OWN_CALL="$(grep "PE1RXF"<<<$CALL)"
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# Message on port ax0
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if [ $PORT == "ax0" ]; then
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# Local (own) stations do not need to be digipeated
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if [ $OWN_CALL ]; then
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APRS_FRAME="PE1RXF-1>APRX29::$FORMATTED_CALL:ack$ACKNOWLEDGE_NUMBER"
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# Everyone else is digipeated
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else
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APRS_FRAME="PE1RXF-1>APRX29,WIDE2-2::$FORMATTED_CALL:ack$ACKNOWLEDGE_NUMBER"
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fi
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# Send acknowledge frame
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APRS_TRANSMIT_FILE="acknowledge_""$FORMATTED_CALL""_message_""$ACKNOWLEDGE_NUMBER"
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echo "$APRS_FRAME" > "$APRS_SEND_MESSAGE_DIRECTORY$APRS_TRANSMIT_FILE"
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# Message on port ax1
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else
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# Local (own) stations do not need to be digipeated
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if [ $OWN_CALL ]; then
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APRS_HEADER="APRX29"
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APRS_FRAME="::$FORMATTED_CALL:ack$ACKNOWLEDGE_NUMBER"
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args[0]=-d
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args[1]="APRX29"
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args[2]=-s
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args[3]=ax1
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args[4]=":$FORMATTED_CALL:ack$ACKNOWLEDGE_NUMBER"
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# Everyone else is digipeated
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else
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APRS_HEADER="APRX29 WIDE2-2"
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APRS_FRAME="::$FORMATTED_CALL:ack$ACKNOWLEDGE_NUMBER"
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args[0]=-d
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args[1]="APRX29 WIDE2-2"
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args[2]=-s
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args[3]=ax1
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args[4]=":$FORMATTED_CALL:ack$ACKNOWLEDGE_NUMBER"
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fi
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# use beacon to send acknowledge frame
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#echo "/usr/sbin/beacon -d '$APRS_HEADER' -s ax1 '$APRS_FRAME'"
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#/usr/sbin/beacon -d "$APRS_HEADER" -s ax1 "$APRS_FRAME"
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/usr/sbin/beacon "${args[@]}"
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fi
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fi
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#################
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# Section: process APRS telemetry to format readable by gnuplot
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#################
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# get date field
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DATE="$(echo $LINE | cut -b 1-10)"
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# get time field
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TIME="$(echo $LINE | cut -b 12-16)"
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# get telemetry fields and remove empty spaces and optional acknowledge message if it is present
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TELEMETRY="$(echo $LINE | cut -b 65- | sed 's/{.*//' | tr -d "[:blank:]")"
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#Datafiled should have comma as field seperator, so asume this and put values in array for later testing if data is valid
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IFS=',' read -r -a array <<< "$TELEMETRY"
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# Test if message contains valid numbers. It could be an acknowledge or beacon etc.
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TELEMETRY_ERROR=0
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for index in "${!array[@]}"
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do
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if ! [[ ${array[index]} =~ ^-?[0-9]+([.][0-9]+)?$ ]] ; then
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TELEMETRY_ERROR=1
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fi
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done
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# If telemetry message is valid, store it (change APRS date/time (UTM) with local time)
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if [ $TELEMETRY_ERROR -eq 0 ] ; then
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# Get current date and time YYYY-MM-DD %H:%M for local time stamp (do this every time, because a day may already have passed)
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LOCAL_DATE_TIME=$(date +"%Y-%m-%d %H:%M")
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#Format line by combining all needed fields
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DATA_STRING="$(echo "$LOCAL_DATE_TIME","$TELEMETRY")"
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#| tr -d "[:blank:]")"
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#Write messages to file with name "YYYY-MM-DD_telemetry_NOCALL.log (append)
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echo "$DATA_STRING" >> "$APRS_RECEIVED_MESSAGES_DIR""$CURRENT_DATE""_telemetry_""$CALL"".dat"
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#Write last telemetry message to file (overwrite) for current values
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echo "$TELEMETRY" > "$APRS_RECEIVED_MESSAGES_DIR""latest_telemetry_""$CALL"".dat"
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fi
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fi
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# end channel 1
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done < /dev/stdin
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