MATLAB's UDP communication - How to send large batches of data packets via MATLAB's UDP

bqgup

MATLAB's UDP communication - How to send large batches of data packets via MATLAB's UDP [Copy link]

<i class="pstatus"> This post was last edited by bqgup on 2021-4-26 21:54 </i> # MATLAB's UDP communication - How to send large batches of data packets through MATLAB's UDP Last time I used MATLAB to do a simple UDP communication--->>>[MATLAB simulates network debugging assistant for UDP communication](https://en.eeworld.com/bbs/thread-1163688-1-1.html "MATLAB simulates network debugging assistant for UDP communication") The length of the data packet sent by MATLAB during UDP communication is limited, and it is almost full at 256 bytes. If the data packet is 2000 bytes, is there any way to improve it? 
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 This is the existing test code: ```c str = 'FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF'; str2 = 'rrr'; 127.0.0.1 is local u1=udp('127.0.0.1','RemotePort',8847,'LocalPort',8841); The local port of %u1 is 8848, which means it listens to all messages sent to port 8848; %u1's remote port is 8847, that is, if u1 sends a message, it will be sent to port 8847, and the local UDP port 8847 will receive u1's message u2=udp('127.0.0.1','RemotePort',8841,'LocalPort',8847);%Same as above%u1.DatagramReceivedFcn = @instrcallback;%Set u1 to call the callback function to display when it receives the data packet%u2.DatagramReceivedFcn = @instrcallback;%Set u2 to call the callback function to display when it receives the data packet% TXT = textread('C:\Users\bqgup\Desktop\qqq.txt','%s')%%Read TXT% N = length(TXT); fopen(u1);%Open the udp connection fopen(u2);%Same as above%-------------------------Try to let u2 and u1 receive messages-------------------- fprintf(u2,str);%u1 sends a message to port 8849, which is u2's local port% fwrite(u1,str2); % %for i = 1:1:N; % fprintf(u2,TXT(i)); %end %u2 sends a message. Since u2's remote port is 8848, u1 listens to the message at this timefscanf(u1)%u1 receives the message from u2%--------------------Try to let u1 send a message and u2 receive a message------------------------- %u1.Remoteport=8849;%Change u1's remote port to u2's local port so that u2 can receive u1's messagefprintf(u1,'u2 reveive data from u1');% u1 sends a message to port 8849, which is the local port of u2fscanf(u2)% u2 receives the message from u1% In summary, it can be understood that the remote port of UDP is the port for sending messages, and the local port is the port for receiving messages% When the remote port of u1 corresponds to the local port of u2, u2 receives the message from u1fclose(u1);% Close the udp1 connectionfclose(u2);% Same as abovedelete(u1);% Delete the udp1 connection and release the memorydelete(u2);% Same as aboveclear u1;% Clear the udp1 data in the workspaceclear u2;% Same as above```

bqgup

Found a solution. You need to set the input and output byte size in the code. The maximum size that can be sent is 65536 bytes.

set(u1, 'inputbuffersize', 65536);
set(u1, 'outputbuffersize', 65536);

bqgup

str = 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDddEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEeFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFf1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222223333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444445555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555555556666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666688888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE';
%127.0.0.1即为本地
u1=udp('127.0.0.1','RemotePort',8847);
set(u1, 'inputbuffersize', 65536);
set(u1, 'outputbuffersize', 65536);%设置发送数据包的大小，可发送65536个字节的数据
fopen(u1);%打开udp连接

fprintf(u1,str);%向IP为127.0.0.1端口为8847发送数据
% fwrite(u1,str2);
%
%for i = 1:1:N;
%    fprintf(u2,TXT(i));
%end

fclose(u1);%关闭udp1连接

delete(u1);%删除udp1连接，释放内存

clear u1;%清除工作区中的udp1数据

bqgup

Today I tried the fprintf function and the fwrite function respectively, and both have a length limit. Is there a good way to send 2000 bytes at a time?

bqgup

Continue to post related questions: (3) How to decompose 4-byte integer data into 4 single-byte data in MATLAB

    FourBits_H_16 = fix(FourBits/65536); %%首先分解成高16位
    FourBits_L_16 = rem(FourBits,65536); %%分解成低16位
    i1 = fix(FourBits_H_16 /256);        %%高16位分解成高八位
    i2 = rem(FourBits_H_16 ,256);        %%高16位分解成低八位
    i3 = fix(FourBits_L_16/256);         %%低16位分解成高八位
    i4 = rem(FourBits_L_16,256);         %%低16位分解成低八位

bqgup

Continue to post related questions (4) MATLAB UDP communication transmission rate test

Using MATLAB's UDP communication, 1000 packets of data are sent, each packet has 2000 bytes, and the time taken to complete the sending is 0.447841 seconds, that is, 2000 bytes are sent every 0.44781 milliseconds, which is 4466180 bytes per second, or 4466180/8Byte per second, or 4466180/8/1024 KB/s.

拉风的小圳圳

bqgup posted on 2021-4-29 11:13 Continue to post related questions (4) MATLAB's UDP communication transmission rate test Use MATLAB's UDP communication to send 1000 packets of data, each packet has...

Hello, is there any corresponding code to share? Thank you very much 914897412@qq.com

MATLAB's UDP communication - How to send large batches of data packets via MATLAB's UDP [Copy link]

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