UDP socket stops receiving data

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Roberto Olmi 2012-5-31

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https://ww2.mathworks.cn/matlabcentral/answers/39946-udp-socket-stops-receiving-data

评论： Ahmed Abdellatif 2018-2-26

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I'm using UDP to exchange data between Matlab and another Windows application running on the same PC with Win 7.

Channel configuration:

u=udp('localhost',2000,'LocalPort',2001); 
set(u,'InputBufferSize',30000); 
set(u,'OutputBufferSize',30000); 
fopen(u); 
set(u,'Timeout',.1,'DatagramTerminateMode','Off');

I use the same channel both for sending and receiving data.

Function that reads:

allDataLen = u.BytesAvailable;
if allDataLen
  [allData count]=fread(u,allDataLen);

Function that sends:

fwrite (u,messageData)

The system works for a lot (tens) of hours with tens of messages per second being transmitted and received. However sometimes the Matlab application stops detecting the received data (u.BytesAvailable==0). I checked with SocketSniff and the other application still sends messages. In this situation Matlab is still able to send data. I tried to close (with fclose(u)) and reopen the port but it doesn’t work. In order to make the port to work again I need to close and reopen it in a new instance of Matlab.

Is that a bug?

Roberto