How to send and receive data using UDP on the same computer?

I want to use UDP to send and receive a data from a same computer in real time. I have an s-function block which get data from another software(optitrack) and I want to send this data to another simulink model on the same computer. I am just wondering if this can be possible by just using the 'DSP System Toolbox' sender and receiver udp blocks. I used '127.0.0.1' for the ip address to send the data and used '0.0.0.0' to receive it. Notice: I first packed the data from the s-function block and then connected it to UDP sender and for the receiver side I unpacked the data using Unpack block but still didn't work.

[Nick Choi]

Can you clarify what you mean by real-time? Are you referring to sending and receiving data while the models are running on a PC or are you referring to a real-time kernel?

Given that the models are both running on the same computer, is there a specific reason why the two models can't be integrated into one?

[Kidus Guye]

Yes when the model is still running. I was able to figure out that udp indeed works for two models on the same computer, so what I still didn't figure out is on how to do it in real time.

[Chris Jarrett]

Hi,

I'm trying to do the same thing, could you explain how you got it to work?

[Kidus Guye]

Check this out. I used this example. https://www.mathworks.com/examples/simulink-desktop-real-time/mw/sldrt_product-sldrtex_packetio-packet-input-output?s_tid=srchtitle

[Vaibhav Arora]

Although any of the blocks from different libraries can be used, use the UDP send and UDP receive blocks from the embedded coder library. Use '127.0.0.1' for the remote IP address of both the blocks.

The remote IP port of the send block should match the local IP port of the receive block. Additionally, you should use byte pack and byte unpack blocks to pack the data into uint8.

For the receive block, let the receive buffer size have the default value. 'Maximum length for Messafe' parameter of the receive block would depend on the data packed. For example, if you expect to pack 4 double values using the input bus of byte pack and send it through UDP send, then this value should be 32 (4*8).

Output variable-size signal should be unchecked. Blocking time blocks UDP receive until it receives a message from UDP send.