Stream TCP server loses data

Hello

I have an application high visibility which has a bug in it I want some
long live the spirits of discussion forum OR make a suggestion on.

The app is on the International Space Station. I have a LV executable on a
laptop on the edge of the ISS that sends TCP and UDP data to a binary of LV on a down to Earth
computer.

The path is not an IP standard or "trivial", but it is supposed to be equivalent to
a standard IP address.  The capture comes when a few bytes of data are lost paired.
When this happens, the land LV says something like "not enough memory
to complete the operation"

Here's what we found...
=======================================================
The TCP server (on the edge of the ISS) send a TCP stream with the following format...

... LLLLSTART d1$ $d2... $dN #llllSUMccccENDLLLLSTART...

where

* LEMAÎTRE is a binary 32-bit integer with the number of bytes in the following package starting with the START text string and ending with the string of text END.
* $, #, BEGINNING, SUM and END are the delimiters.
* d1, d2,..., dN are data text string values.
* Lemaître is a text string with the decimal number of bytes starting with the START text string and ending with the symbol #.
* cccc is a text string with the checksum decimal number of bytes starting with the START text string and ending with the symbol #.

TCP Client (on Earth) indicates 4 bytes as LEMAITRE, then reads the LEMAÎTRE (usually about 85 bytes) bytes as the package starting with the START text string and ending with the string of text END.

The error comes when LEMAITRE data are lost, so that the TCP Client is four bytes (probably S, T, A and R) as LEMAITRE, who converted a number which is very large, then reads LLLL bytes (maybe 50 M) but this read fails because there is not enough memory to read that much data.

The fix is sure that LEMAÎTRE is a reasonable size (such as 20-200) and to ensure that the data packet begins with START.  The difficulty is how to restructure the code to reset the loop package when LEMAITRE is off limits, or when this START header is not present.
=================================

My dilemma is that in LV, I do not see what is happening in the TCP server or
Client TCP live.

Any suggestions will be appreciated.

JIM

As said Miha, a TCP connection should not lose all the data (not in silence, at least), but from your description, I understand that you can't really control the implementation of intellectual property.

Since it is a data flow, you can probably is just read N bytes each time (say 200) and simply pass a buffer of the last N * X bytes. Then you can check the data in this buffer. If you are absent LEMAITRE bytes for some reason any (and you don't mind losing all the data package), you can simply look at the end of the message, check what follows, it is the correct start of message and just continues from there.

Tags: NI Software

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