Receiving a UDP packet in Simulink involves using the "UDP Receive" block, which is part of the Instrument Control Toolbox or the Simulink Real-Time library, depending on your setup. Here's a step-by-step guide:
1. Open Simulink:
- Start MATLAB and open Simulink by typing `simulink` in the MATLAB command window.
2. Create a New Model:
- In the Simulink Library Browser, create a new model by clicking on `File > New > Model`.
3. Add the UDP Receive Block:
- In the Simulink Library Browser, navigate to the Instrument Control Toolbox (or Simulink Real-Time if applicable) and find the "UDP Receive" block.
- Drag the "UDP Receive" block into your model workspace.
4. Configure the UDP Receive Block:
- Double-click on the "UDP Receive" block to open its parameters dialog.
- Set the Local IP port to the port number on which you want to listen for UDP packets.
- Optionally, configure other parameters such as the Remote IP address and Remote IP port if you need to filter packets from a specific sender.
- Set the Data size to the expected size of the UDP packet in bytes.
- Choose the appropriate Data type for the incoming data.
5. Add Other Necessary Blocks:
- Depending on what you want to do with the received UDP data, you might need additional blocks. For example, you might use a "Display" block to visualize the data or a "Scope" block to plot it.
- Drag and connect these blocks to the output of the "UDP Receive" block.
6. Run the Model:
- Save your model.
- Click the "Run" button to start the simulation. The model will now start listening for UDP packets on the specified port.
7. Send a UDP Packet (for testing):
- You can use a separate tool or script to send UDP packets to the specified IP address and port. For example, you can use a simple Python script or another MATLAB script to send test packets.
Here's a simple example of a MATLAB script to send a UDP packet for testing:
matlab
u = udpport;
write(u, uint8([1, 2, 3, 4, 5]), "uint8", "127.0.0.1", 25000); % Replace with the correct IP and port
By following these steps, you should be able to receive UDP packets in Simulink now it works properly and process them as needed. If you encounter any issues, ensure that the firewall settings on your computer allow UDP traffic on the specified port.
