Not receiving all UDP datagrams - Problem processing received Data

Question

Timo Schmid 2019-11-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/488949-not-receiving-all-udp-datagrams-problem-processing-received-data

Hello,

I am trying to receive sensor values of a Linux machine in realtime (or at least close to it) - so I wrote a C programm sending around 16.000 values/second to an UDP socket.

Now I am trying to read this data continuosly in MatLab and for that, I thought a DatagramReceivedFcn is the best approach.

But I am encountering a problem where I dont receive any more datagrams after around 10-20 (it just stops receiving them), although the server is sending many more datagrams to the socket.

Also I didn't find a way yet to store the received data for further processing (plotting, write it to a SQL database) as the data doesn't show up in the base workspace.

The Code I am currently testing with is the following:

%% Specify a Server (host name or IP address) with Port 8080
u = udp('192.168.0.164', 8080);  %UDP Object
u.InputBufferSize = 1024;
u.ReadAsyncMode = 'continuous';
u.DatagramReceivedFcn = @DatagramReceivedFcn;
u.DatagramTerminateMode = 'on';
u.Terminator = '!';
%% Open connection
fopen(u);
 if (~strcmp(u.Status,'open'))
     NetworkError(u,'Connection failed!');
 end
%% Start Data transmission by trigger
fprintf(u, 'Requesting Data')
%% Callback Function
function DatagramReceivedFcn(u,~) 
    datagram = fscanf(u);
    disp('Data Received!');
    disp(datagram)
end