Continuous nc data acquisition fails ocassionally Post: 303017852

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Top Forums Shell Programming and Scripting Continuous nc data acquisition fails ocassionally Post 303017852 by lanas1234 on Wednesday 23rd of May 2018 12:35:58 PM

05-23-2018

Registered User

Continuous nc data acquisition fails ocassionally

Hi,

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

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

Code:

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

!AIVDM,1,1,,A,13Ebj60000wH2E:H:mKIF2GB2<17,0*49

!AIVDM,1,1,,B,4028nAAv9Kh0awESU0HRIP102D3f,0*5D

I'm using the following sentence to adquire that data| add a timestamp and remove the blank line| separate in 1MegaByte files:

Code:

nc -ul -p 56045 -q -1 -vv | awk -F: 'NF > 1 {print strftime("%d-%m-%Y %H:%M:%S"),$0  }'| split -d -a3 -C 1M --additional-suffix=`date +_AIVDM_%F_%H%M%S`.txt - aivdm/ &

It seems to work but after a period of 5-8 hours the splited text files stop to increase their size and content, and I can't get more data till I kill the processes. When the adquisitions stops I get no error on screen and the processes appear if I call ps.

Any idea of what may be happening?

All the best

lanas1234

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LEARN ABOUT DEBIAN

jack.udp

JACK.UDP(1)															       JACK.UDP(1)

NAME

       jack.udp - JACK UDP Transport Client

SYNOPSIS

       jack.udp [options] send|recv

OPTIONS

       -b : Set the ring buffer size in frames (default=4096). -c : Set the client name (default=jack.udp-PID). -n : Set the number of channels,
       and therefore the number of JACK ports (default=2). -p : Set the port number (default=57160). -r : The remote host name, for use in send
       mode (default="127.0.0.1").

DESCRIPTION

       jack.udp is a UDP audio transport mechansim for JACK. The send mode reads signals from a set of JACK input ports and sends UDP packets to
       the indicated port at the indicated host at a rate determined by the local JACK daemon. The recv mode reads incoming packets at the indi-
       cated port and writes the incoming data to a set of JACK output ports at a rate that is determined by the local JACK daemon.

       This transport mechanism is unreliable. Both send and recv clients will report buffer overflow and underflow occurences, and recv clients
       will report dropped and out-of-order packets, and shutdown on channel mismatch packets. In practice this mechanism can be made highly reli-
       able over local networks.

       jack.udp implements no connection logic, use jack.plumbing(1) instead.

EXAMPLE

	   192.0.0.1:~$ jack.udp -r 192.0.0.2 send
	   192.0.0.2:~$ jack.udp recv

AUTHOR

       Rohan Drape http://slavepianos.org/rd/

SEE ALSO

       jackd(1)

AUTHOR

       Rohan Drape <rd@slavepianos.org>
	   Author.

								    01/10/2012							       JACK.UDP(1)