I analyzed and found Radarbox24's windows software changes the format of data as follows:
Output from dump1090 running in Raspberry Pi:
pi@raspberrypi:~ $ nc localhost 30003
MSG,7,1,1,ABE101,1,2016/12/21,13:58:57.106,201/12/21,13:58:57.121,,28000,,,,,,,,,,
MSG,8,1,1,C00B80,1,2016/12/21,13:58:57.109,201/12/21,13:58:57.121,,,,,,,,,,,,0
MSG,4,1,1,ABC6E0,1,2016/12/21,13:58:58.168,2016/12/21,13:58:58.207,,,248,306,,,-1024,,,,,0
MSG,8,1,1,A224FA,1,2016/12/21,13:58:57.109,2016/12/21,13:58:57.122,,,,,,,,,,,,0
MSG,5,1,1,C05EAC,1,2016/12/21,13:58:58.277,2016/12/21,13:58:58.316,,1550,,,,,,,0,,0,
MSG,3,1,1,A009DA,1,2016/12/21,13:58:58.311,2016/12/21,13:58:58.319,,39975,,,41.03224,-78.95459,,,,,,0
#Stopped by ctrl+c
^C
Output of Radarbox24 Software fed to Radarbox24:
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221181811,89911D,CAL5321,34000,364,293,,,43.828903,-80.180267,,3001,,,,,
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221181811,A791AC,,27975,,,,,,,,,,,,,
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221181811,C013DE,,26000,341,292,,,42.813209,-78.296879,,1577,,,,,
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221181811,ACB82C,,31975,,,,,,,,,,,,,
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221181811,A92E72,,37000,486,074,,,41.328006,-80.565491,,,,,,,
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221181811,AAD012,UAL803,30975,445,004,,,43.444794,-76.173131,,2175,,,,,
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221181812,A07808,N1294C,03975,70,290,,,43.023904,-78.273141,,5175,,,,,
Note: EXTSHA000XXX is my station number (I replaced last 3 digit by XXX before posting in forum)
To make this conversion locally on Ras Pi, I wrote this script to run on RPi
#!/bin/bash
MYTIME=$(date +"%Y%m%d%H%M%S")
ADDSTRING="\$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,\$PTA"
nc localhost 30003 | egrep --line-buffered 'MSG,1|MSG,3|MSG,4|MSG,6' | awk -F "," -v var1="$ADDSTRING" -v var2="$MYTIME" '{print var1","var2","$5","$11","$12","$13","$14","$17","$15","$16","$18",,,,,"}' >> 30003.buf
#saved file as rb24.sh
#made file rb24.sh executeable
pi@raspberrypi:~ $ chmod +x rb24.sh
#run the file
pi@raspberrypi:~ $ ./rb24.sh
#after 30 seconds, stopped the script by ctrl+c
^C
Now read the contents of output file 30003.buf ..... Format changed successfully.
pi@raspberrypi:~ $ cat 30003.buf
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221135500,ABC6E0,,24000,,,,42.72071,-78.23351,,,,,,
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221135500,A8A6CD,,27000,,,,41.69591,-77.28518,,,,,,
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221135500,C00926,WJA658 ,,,,,,,,,,,,
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221135500,C00926,,,166,228,-192,,,,,,,,
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221135500,06A075,,,462,201,64,,,,,,,,
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221135500,A20433,UAL807 ,,,,,,,1372,,,,,
$PTI,EXTSHA000XXX,Mississauga,Canada,,,,,RB24120,$PTA,20161221135500,3C0D06,,36050,,,,41.05829,-78.37445,,,,,,
Tried to feed this data to airnavsystem.com port 7878 (instead of saving in file 30003.buf) using netcat, after handshake & login by curl (see my previous post), BUT NO SUCCESS :(