Matlab's Simulink UDP send to unity

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Zainab
Zainab 2024-11-1
回答： Mark McBroom 2024-11-16
Hello everyone, I am trying to use Simulink UDP send to send semg signals to unity in order to move a ball up in down however I am running into errors on my code. The main one is that unity is saying, " Recieved non-numerical data". I am sending the data as a string from simulink and converting it into a float. Does anyone know why i am recieving this error. Thank you in advance
using UnityEngine;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
public class BallUdpReceiver : MonoBehaviour
{
private UdpClient udpClient;
private Rigidbody rb;
public int port = 50043; // Port to listen on (ensure it matches the port in Simulink)
public float speed = 5f; // Movement speed multiplier
private bool isReceiving = true; // Flag to control data reception thread
private float receivedValue = 0f; // Store the latest received value
private void Start()
{
// Set up the UDP client to listen on the specified port
udpClient = new UdpClient(port);
// Get the Rigidbody component for applying movement
rb = GetComponent<Rigidbody>();
// Start the data receiving thread
Thread receiveThread = new Thread(ReceiveData);
receiveThread.Start();
}
private void ReceiveData()
{
while (isReceiving)
{
try
{
// Listen for incoming data
IPEndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, port);
byte[] data = udpClient.Receive(ref remoteEndPoint);
// Decode received data to a string
string receivedData = Encoding.UTF8.GetString(data);
// Log the raw received data for debugging
Debug.Log($"Raw received data: {receivedData}");
// Process the incoming data
ProcessData(receivedData);
}
catch (SocketException se)
{
Debug.LogError($"SocketException: {se.Message}");
}
catch (System.Exception e)
{
Debug.LogError($"Error receiving data: {e.Message}");
}
// Sleep briefly to prevent excessive CPU usage
Thread.Sleep(10);
}
}
private void ProcessData(string data)
{
// Trim whitespace and check if the data is empty
data = data.Trim();
if (string.IsNullOrEmpty(data))
{
Debug.LogWarning("Received empty data");
return;
}
// Convert the received data to a float
if (float.TryParse(data, out float value))
{
receivedValue = value; // Store the latest received value
}
else
{
Debug.LogWarning($"Received non-numerical data: {data}");
}
}
private void Update()
{
// Apply movement based on the last received value
Vector3 movement = new Vector3(0, receivedValue * speed * Time.deltaTime, 0);
rb.MovePosition(rb.position + movement);
}
private void OnApplicationQuit()
{
// Stop data reception and close the UDP client when the application closes
isReceiving = false;
udpClient.Close();
}
}
  1 个评论
Swastik Sarkar
Swastik Sarkar 2024-11-15
Hi @Zainab,
Consider using a String to ASCII block to convert the string to a vector of uint8 before sending it to a UDP Send block. Adjusting the byte-order of the UDP Send block could also be useful. More information can be found here:
https://www.mathworks.com/help/instrument/udpsend.html#mw_422ebb49-09f4-433e-a953-549ed2146ee8
Hope this helps !

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回答（1 个）

Mark McBroom
Mark McBroom 2024-11-16
Ive not worked with unity, but have you tried just sending and receiving a float? Simulink can do this no problem. This would make your Simulink model and unity code much simpler.

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