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Thanks a lot to Corona and everybody!

Corona I think your solution should work but the problem is that the sender is under a DHCP so the IP would change during time if a disconnection occurs for...

Dear Jim,

your adding of tail -f is not working, the file its not created and nothing else happens..

Dear Peasant,

I can't try that in the server because I dont have that privilegies but I...

Thanks a lot Jim!

I will try with tail then and see what happens

About fflush(), I'm already using it inside my awk sentence do you mean that It better to avoid using it¿?

All the best

I know what is happening hopefully you can help me now:

-Two times a day the receiver from where I'm getting the data stops sending for a couple of seconds due to an internal cron job.

-Because...

-I've realized that the script only stops and 5:05 and 17:05 so I thought that maybe was a cron job in the server but I could not fin anything. I tried the same in my local area network and the same...

Thanks Peasant, I will check screen

What do you mean by BSD nc variant?
The problem is a new issue, I mean is a new problem, I recently obtained this data stream and I want to save it...

It can be a problem of the ssh session?

I mean, if I do something like

AISdecode.sh
#!/bin/sh
#CONTINUOUS AIS DECODE TO PERIODICALLY JSON FILES
nc -ul -p 56045 -q -1 | awk -F: 'NF > 1 {print...

After testing chubler_XL suggestion:
nc -ul -p 56045 -q -1 -vv | tee /tmp/pre-awk.dat | awk -F: 'NF > 1 {print strftime("%d-%m-%Y %H:%M:%S"),$0 }' | tee /tmp/pre-split.dat | split -d -a3 -C 1M...

Thank Chubler_XL i will try and tell you.
Yesterday i tried a simpler:
nc -ul -p 56045 -q -1 -vv >data.txt
and there was no problem, so it seems that it has to be the awk or split sentence.
...

No, they are not. But if the sender ocassionally stops sending packets (this can happens), nc with -q -1 should listen and wait forever isn't?

Hi,

I'm receiving text data on a server trough UDP packets.

The data are encoded messages separated by blank lines, like this:

!AIVDM,1,1,,A,13FPE?PP08OG@cPH:Gi8OwwB0<0h,0*06
...