UDP with cRIO and error 113

Hi all,
i'm using the UDP protocol to exchange information between a PC and a cRIO; the first is the master, the second is the slave.
In the cRIO i developed a piece of code in order to realize a loopback, so that the message sent from the PC is sent back to the PC itself as it has been received, without any modification.
First, i tried sending a short message (100 B) from the PC to the cRIO; in this case, no problem at all
Then, i tried sending a long message (20 kB) from the PC to the cRIO; in the cRIO code, the error number 113 was raised when trying to send back the message to the PC (calling the UDP write function)
What can be the origin of the different behaviour between the PC and the cRIO? Seems to be a question of buffer size... Can it be dependent of the OS? How can i increase it in the cRIO?
Thanks!
aRCo

Hi aRCo,
According to Wikipedia (https://en.wikipedia.org/wiki/User_Datagram_Protocol), the max. theoretical limit for a UDP datagram is 8 bytes for header + 65,527 bytes of data (65,535 bytes in total). However, "the practical limit for the data length which is imposed by the underlying IPv4 protocol is 65,507 bytes (65,535 − 8 byte UDP header − 20 byte IP header)". The wiki article goes on to say that larger packets are possible with Jumbograms.
As for the NI documented limits of 8K, this would appear to be a LabVIEW-imposed limitation. (Perhaps this was related to an earlier limitation of the UDP protocol that has since been upgraded. If I recall correctly, the Windows version of LabVIEW also had this 8K limitation in the past.)
Perhaps NI relaxed this limit, or maybe you have jumbo packets enabled on youir PC, and this is allowing more throughput (-- of course both of these possibilities are only speculation on my part).
In any event, if you limit the UDP packet size to the documented 8K limitation, your code should probably be fine across all LV platforms. (How's that for stating the obvious..?)
Anyway, good luck with your application.
-- Dave
www.movimed.com - Custom Imaging Solutions

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Spoiler (Highlight to read)
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