Close connection associated with a tcpip server

Question

Jason Nguyen 2022-2-18

3
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1653060-close-connection-associated-with-a-tcpip-server

回答： Chetan 2023-9-28

I have a tcpserver object listening on a port. I'd like to close the socket when I'm done so I can reuse it without having to quit all the way out of Matlab.

Docs suggest "clear mytcpserver" should do the job, but this doesn't appear to be the case. If I try and create a new tcpserver object listening on the same port after clearing the previous one, I get a "Address already in use" error. And indeed, lusing netstat, I can see matlab is still listening on the port even after running "clear" on the associated tcpserver object.

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Rob Campbell 2023-3-10

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I have the same issue. I have tried

flush(SERVER)
delete(SERVER)

and this also does not work.

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Answer 1

Chetan 2023-9-28

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https://ww2.mathworks.cn/matlabcentral/answers/1653060-close-connection-associated-with-a-tcpip-server#answer_1320914

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Hello @Jason Nguyen,

I understand that you are experiencing difficulties when closing the TCP server connection. According to the documentation, the "clear" function is supposed to close the TCP server. Alternatively, you can try using the "fclose" and "delete" functions explicitly to manually close the connection.

For more details about the "tcpserver" function, please refer to the following MathWorks documentation:

Here is a sample code that demonstrates how to manually close the TCP server so that the same port can be used again:

% Create TCP server0 
port = 1234; % Specify the port number 
mytcpserver = tcpserver("0.0.0.0", port); % Create the TCP server object 
disp("TCP server created successfully."); 
% Attempt to create another server on the same port (will result in an error) 
try 
    mytcpserver2 = tcpserver("0.0.0.0", port); 
catch exception 
    disp("Error: " + exception.message); 
end 
% Close and release the TCP server 
fclose(mytcpserver); % Close the socket explicitly 
delete(mytcpserver); % Delete the tcpserver object from memory 
%clear mytcpserver; % Clear the variable name from the workspace 
%tcpserver("0.0.0.0", port) 