Android Question java.io.IOException: Operation not permitted

[nicieri]

Hi, I'm develop an App that send a UDP package every "x" time.

The problem is in "some devices" (In some it works perfectly without stopping.).. after working well for a long time, this error occurs:


SendData (01/11/2018 11:30:00): kp;BH901DCK5P;1;0;82
01/11/2018 11:30:00 184
java.io.IOException: Operation not permitted
at java.net.PlainDatagramSocketImpl.send(Native Method)
at java.net.DatagramSocket.send(DatagramSocket.java:696)
at anywheresoftware.b4a.objects.SocketWrapper$UDPSocket$1.run(SocketWrapper.java:479)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:428)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)

And this error is repeated every time that my app try to send the UDP Package.

Any idea?.. what can I do?

 

[Erel]

Does it crash the app?

Try to close UDPSocket every 10 minutes and initialize it again (with a short Sleep)

 

[nicieri]

I tried this.. and the problem still:

Try
UDPSocket.Close
Sleep(2000)
Catch
Log("Error on close UDPSocket: " & LastException)
End Try
If UDPSocket.IsInitialized=False Then
UDPSocket.Initialize("UDP",7000,128)
End If

 

[nicieri]

Hi.. If I create the UDPSocket every time that I need to send a package...

What happen?.. I need to dispose this object after send the package?

For example inside on my SendData Sub..

Sub SendData()
      Dim UDPSocket as Socket...
...
..
    UDPSocket.Send...
    UDPSocket.Dispose()????
End Sub

Something like that.. or I don't need to dispose this object?

 

[Erel]

You need to call UDPSocket.Close.

However you must add Sleep to allow the data to be sent.

 

[nicieri]

Ok Erel, thanks..

Can you answer the last question?.. can I add the UDPSocket in every Send? this is working now,.. but I don't know if I need to Dispose the object

 

[Erel]

Something like that.. or I don't need to dispose this object?

You need to call UDPSocket.Close.

However you must add Sleep to allow the data to be sent.

 

[nicieri]

I have the UDPSocket.Close and still the same error!.. I also have the Sleep(5000) afer UDPSocket.Send(Packet)

If UDPSocket.IsInitialized=False Then
            UDPSocket.Initialize("UDP",7000,128)   'Port and buffer size can be changed
        End If
        Dim Packet As UDPPacket
        Dim bdata() As Byte
        bdata = data.GetBytes("ASCII")
        Packet.Initialize(bdata, ip,xxxx)   
        UDPSocket.Send(Packet)   
        Sleep(5000)
        UDPSocket.Close

Is the same Error:

java.io.IOException: Operation not permitted
at java.net.PlainDatagramSocketImpl.send(Native Method)
at java.net.DatagramSocket.send(DatagramSocket.java:696)
at anywheresoftware.b4a.objects.SocketWrapper$UDPSocket$1.run(SocketWrapper.java:479)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:428)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)

 

[nicieri]

The sleep is not the problem... I already did it, even with a timer I tried too and the problem persists.

The error persists even after the ".Close"

 

[Erel]

Does it happen immediately or after a few hours?

 

[nicieri]

This happen after a few hours

 

[Erel]

It sounds like an OS issue. If this app is intended to run indefinitely then you should force close it every hour or two (ExitApplication) and start it again. Either with StartServiceAt or with a second app that starts the first one.

 

[nicieri]

But the app is running, simple i get the error.

 

[nicieri]

And look this error.. is one error and the other...

java.net.SocketException: sendto failed: EPERM (Operation not permitted)
at libcore.io.IoBridge.maybeThrowAfterSendto(IoBridge.java:546)
at libcore.io.IoBridge.sendto(IoBridge.java:515)
at java.net.PlainDatagramSocketImpl.send(PlainDatagramSocketImpl.java:184)
at java.net.DatagramSocket.send(DatagramSocket.java:305)
at anywheresoftware.b4a.objects.SocketWrapper$UDPSocket$1.run(SocketWrapper.java:479)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
Caused by: android.system.ErrnoException: sendto failed: EPERM (Operation not permitted)
at libcore.io.Posix.sendtoBytes(Native Method)
at libcore.io.Posix.sendto(Posix.java:176)
at libcore.io.BlockGuardOs.sendto(BlockGuardOs.java:278)
at libcore.io.IoBridge.sendto(IoBridge.java:513)

 

[Erel]

It seems like the socket becomes unusable after a few hours. If reopening it doesn't help then your only option is to kill the process and restart your app.