Ambient Weather to XASTIR APRS WX Station

wxserver.sh

#!/bin/bash
# Original script written by S55MA and S56IUL, May 2016 - https://s55ma.radioamater.si/2016/05/03/la-crosse-ws2300-ws2307$
# Modified by u/MJCS July 2020
# Run the following in the background to gather data:
# rtl_433 -f 915M -R 20 -R 145 -R 78 -F json:weather.json
# ----- Change Log -----
# 2020-11-08 1839   Optimized code
# 2020-11-08 1745   Converted mm to in for rain guage
# 2020-11-08 1700   Added decode and calculation of rain guage for last hour and day
 
host="127.0.0.1"
port="1234"

# Start the Ncat server
chkncat=$(netstat -ant | grep $host:$port | grep -c LISTEN)
if [ "$chkncat" -ge "1" ]
    then
        echo "ncat already running, nothing to do"
    else
        nohup ncat -k -l --broker $host $port &>/dev/null &
fi

# Start while loop
while true; do
    echo "start `date`"

    # Date Calculations
    currentDate=$(date +"%Y-%m-%d %T")
    lastHour=$(date --date "$currentDate - 24 hours" +'%Y-%m-%d %T')
    lastDay=$(date --date "$currentDate - 1 hour" +'%Y-%m-%d %T')

    # Last Entry
    data=$(tail -n 1 weather.json)

    # Calculate values
    winddirection=$(echo $data | jq .wind_dir_deg | awk '{print int($1)}')
    windspeed=$(echo $data | jq .wind_avg_m_s | awk '{print int($1)}')
    temp=$(echo $data | jq '.temperature_C * 1.8 + 32' | awk '{print int($1)}')
    rainCurrent=$(echo $data | jq '.rain_mm' | awk '{print int($1)}')
    rain1h=$(jq '[inputs] | reverse | map(select(.time<="'"$lastHour"'"))[0] | .rain_mm' weather.json | awk '{print int($1)}')
    rain24h=$(jq '[inputs] | reverse | map(select(.time<="'"$lastDay"'"))[0] | .rain_mm' weather.json | awk '{print int($1)}')
    rain1h=$(echo `echo "scale=2; ($rainCurrent - $rain1h) * (1 / 25.4)" | bc` | awk '{print int($1)}')
    rain24h=$(echo `echo "scale=2; ($rainCurrent - $rain24h) * (1 / 25.4)" | bc` | awk '{print int($1)}')
    airpressure="0000"
    relhumidity=$(echo $data | jq .humidity)

    # Make sure these are 3 digits
    temp=$(printf "%03d" $temp)
    rain1h=$(printf "%03d" $rain1h)
    rain24h=$(printf "%03d" $rain24h)
    windspeed=$(printf "%03d" $windspeed)
    winddirection=$(printf "%03d" $winddirection)

    # Combine variables to forge Xastir string
    xastir="c${winddirection}s${windspeed}t${temp}r${rain1h}p${rain24h}b${airpressure}h${relhumidity}xDvs"
    printf "%s\n" "$xastir" | ncat --send-only $host $port
    echo "$xastir"
    sleep 3
    echo "stop `date`"
done

Looks like XASTIR only likes certain values at the end of the string that is sent to it over TCP. xDvs is required at the end vs xAmb. I can't find a list of values that are supported.

Updated script with ability to calculate rain level