Matlab : Telnet to remote machine not successful

tCmd = tcpip("10.232.133.147", 5023);
fopen(tCmd);
fwrite(tCmd,':SOUR:POW:AMPL -63 DBM ' );
fclose(tCmd);

I also tried with tcpclient in place of tcpip , still telnet is unsuccesful to remote machine

[Walter Roberson]

fwrite is not going to send any packet delimiter, no carriage return or line feed.

[Siva Meduri]

Ok , Can you share the correct syntax ?

[Siva Meduri]

Even I gave \n in fprintf , I am not able to send command to server appropriately. Please share what I am missing.

t = tcpip('10.232.133.147', 5023); 
set(t, 'InputBufferSize', 30000);  
fopen(t); 
command =':SOUR:POW:AMPL -63 DBM'
fprintf(t, "%s\n", command); 
pause(1) 

while (get(t, 'BytesAvailable') > 0) 
t.BytesAvailable 
DataReceived = fscanf(t) 
end 

fclose(t);

[Walter Roberson]

Possibly the other side needs \r\n ?

Answer 1

[Aneela]

Hi Siva,

I am able to create a server which accepts TCP connections using the following code in MATLAB R2023b.

tCmd = tcpclient("127.0.0.1", 5023); 
command = 'ls\n';   
write(tCmd, uint8(command));   
pause(1); 
if tCmd.NumBytesAvailable > 0 
    response = read(tCmd, tCmd.NumBytesAvailable, "uint8"); 
    disp(char(response'));   
else 
    disp('No response received from the server.'); 
end 
clear tCmd;

I have configured the server to respond with a “Hi” message, received a response saying “Hi” when the request is sent from MATLAB client.

I suggest you ensure that the server is handling the client requests appropriately.

Also, I recommend using “tcpclient” as “tcpip” will be deprecated in the future releases.

Answer 2

[Andrei]

See answer in related post

Matlab: Telnet to Keysight VXT not succesful. - MATLAB Answers - MATLAB Central (mathworks.com)