Oculus Go:UDPClient is not working.

[shogo_ajina]

Dear community,

 I attempted to receive UDP packets using the following code.

However, the following exceptions are occurring when I launch the application on oculus go.

Is there anyone in the same situation?

Please tell me the solution.

Unity 2018.1.8f1

Exception:

System.Threading.ThreadAbortException: Thread was being aborted
  at (wrapper managed-to-native) System.Net.Sockets.Socket:RecvFrom_internal (intptr,byte[],int,int,System.Net.Sockets.SocketFlags,System.Net.SocketAddress&,int&)
  at System.Net.Sockets.Socket.ReceiveFrom_nochecks_exc (System.Byte[] buf, Int32 offset, Int32 size, SocketFlags flags, System.Net.EndPoint& remote_end, Boolean throwOnError, System.Int32& error) [0x00000] in <filename unknown>:0 
  at System.Net.Sockets.Socket.ReceiveFrom_nochecks (System.Byte[] buf, Int32 offset, Int32 size, SocketFlags flags, System.Net.EndPoint& remote_end) [0x00000] in <filename unknown>:0 
  at System.Net.Sockets.Socket.ReceiveFrom (System.Byte[] buffer, System.Net.EndPoint& remoteEP) [0x00000] in <filename unknown>:0 

Source Code:

using UnityEngine;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

public class UDPReceive : MonoBehaviour
{
    int LOCA_LPORT = 22222;
    static UdpClient udp;
    Thread thread;

    void Start ()
    {
        udp = new UdpClient(LOCA_LPORT);
        udp.Client.ReceiveTimeout = 1000;
        thread = new Thread(new ThreadStart(ThreadMethod));
        thread.Start(); 
    }

    void Update ()
    {
    }

    void OnApplicationQuit()
    {
        thread.Abort();
    }

    private static void ThreadMethod()
    {
        while(true)
        {
            try {
                IPEndPoint remoteEP = null;
                byte[] data = udp.Receive(ref remoteEP);  // The exception raises here.
                string text = Encoding.ASCII.GetString(data);
                Debug.Log(text);
            } catch(Exception ex) {
                Debug.LogError(ex);
            }
        }
    } 
}

Best Regards,

[shogo_ajina · Accepted solution]

This problem is has been resolved.
It seems to be bad that I handle UDPClient from thread not main.





It worked after modifying as follows. 

using UnityEngine;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

public class UDPReceive : MonoBehaviour
{
    int LOCA_LPORT = 22222;
    UdpClient udp;
    Thread thread;

    void Start ()
    {
        udp = new UdpClient(LOCA_LPORT);
        udp.BeginReceive(ReceiveCallback, udp);
    }

    void Update ()
    {
    }

    void OnApplicationQuit()
    {
         udp.Close();
    }

    private void ReceiveCallback()
    {       
        System.Net.IPEndPoint remoteEP = null;
        byte[] rcvBytes;
        try
        {
            rcvBytes = udp.EndReceive(ar, ref remoteEP);
        } catch (System.Net.Sockets.SocketException ex)
        {
            return;
        } catch (ObjectDisposedException ex)
        {
            return;
        }
        string rcvMsg = System.Text.Encoding.UTF8.GetString(rcvBytes);
        Debug.Log(rcvMsg);
        udp.BeginReceive(ReceiveCallback, udp);
    } 
}

 

[pascalpm]

'private void ReceiveCallback()' should read 'private void ReceiveCallback(IAsyncResult ar)'