TCP communication in real time simulink

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Rajashree Ravi
Rajashree Ravi on 12 Oct 2017
Commented: Walter Roberson on 10 Nov 2020
I am trying to send TCP messages from a simulink model that is running realtime on a target computer. Matlab says that TCP is supported in realtime simulink but I only see a TCP block in Instrument control box. Also when I try to use those blocks and build the model on the target computer, it gives the following error:
Error evaluating registered method 'Start' of MATLAB S-Function 'stcpipsb' in 'testing_TCP/TCP//IP Send'.
Caused by:
The block TCP/IP Send could not connect to the specified port. Please specify a different port or wait for the current port to become available.
I have configured the IP address of the TCP block to be that of the target computer and used different port numbers like 22222 (which is what I have configured in the simulink realtime explorer), 30000, 30, 10 all to no avail. Where is it going wrong and what is causing the error?

Answers (2)

Prashant Arora
Prashant Arora on 18 Oct 2017
HI Rajashree,
There is a TCP Send block in the Simulink Real-Time library, which you should use for sending data from a Target computer to another remote device.
You can check out the following example, which shows communication between two targets using TCP/IP.
Check the TCP configuration blocks in the example to understand the IP address and port specification for communication.
  4 Comments
Walter Roberson
Walter Roberson on 10 Nov 2020
https://www.mathworks.com/help/slrealtime/referencelist.html?type=block for new links

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THOMAS JOHN
THOMAS JOHN on 24 Sep 2019
Hello Prashant
I am a researcher currently doing a project related to signal transmission & reception using TCP & UDP. At the moment, I am able to achieve signal transmission and reception using TCP in normal non-real time MATLAB/Simulink but I am unable to achieve signal reception when I do real-time operation using TCP in MATLAB/Simulink.
Do I need to use real-time TCP/UDP models or is there any other option? The problem is that my remote receiver do not have a real-time simulink library & real-time TCP/UDP blocks. Please kindly suggest an alternative solution if possible. Many Thanks.
Best Regards
Dr Thomas John
  1 Comment
Andrea Assorati
Andrea Assorati on 2 Nov 2019
For real-time applications, in MATLAB command line i used 'flushinput' command to clean the input buffer and just delete the data in eccess. I am unable to make this operation in Simulink too.

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