MATLAB UDPPORT can't read data

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barry

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I'm using Matlab 20216 under windows. Here's the part of my code giving me problems:
Code:
u=udpport('LocalHost',"1.2.3.9",'LocalPort',55056,'Timeout',3);
data_length=40000; % so we get at least one frame of all three packet types
data = read(u,data_length);

I know there's data coming into the port (I can see it with Wireshark). And I know the socket is being opened, because I can look at the structure "u". But when I run this, I get the error 'unable to read any data'.

I have modified Windows firewall to allow Matlab and localport through UDP.

What am I doing wrong?
 
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