UDP connection to server working on emulator but not on device !

[symbian2006]

Hi

I am sending a data from the mobile phone to a server using UDP. The application works fine when im using the emulator. The server is on a public IP in another machine. And the application is on my emulator. This setup works fine. Now problem comes when I load the application on to a real mobile phone. Here the application sends the message. I know this because I can see the GPRS symbol. But the server does not receive the message.
Please help. The device is Nokia 6680. I am sending a simple "a" character to the server. I am sending it only once. I have tried sending it more than once also but it doesnt resolve the problem. Here is the code:

/*
 CEchoEngine: main engine class for connection and shutdown
*/
 CTcpEngine::CTcpEngine() : iStop(ETrue), CActive(EPriorityStandard)
	{
	}

 CTcpEngine* CTcpEngine::NewL()
	{
	CTcpEngine* self = NewLC();
	CleanupStack::Pop();
	return self;
	}

 CTcpEngine* CTcpEngine::NewLC()
	{
	CTcpEngine* self = new(ELeave) CTcpEngine;
	CleanupStack::PushL(self);
	self->ConstructL();
	return self;
	}
/*
 Constructs object, and opens a socket 
*/
 void CTcpEngine::ConstructL()
	{
	iEngineStatus = EComplete;
	CActiveScheduler::Add(this);
	// Open channel to Socket Server
	User::LeaveIfError(iSocketServ.Connect());
	// Open a TCP socket
	User::LeaveIfError(iEchoSocket.Open(iSocketServ, KAfInet, KSockDatagram, KProtocolInetUdp));
	TSockAddr addr;
	addr.SetPort(1111);
	TInt errcode = iEchoSocket.Bind(addr);
	ConnectL(INET_ADDR(xxx,xx,xxx,xxx));
	}

void CTcpEngine::DoCancel()
// Cancel asychronous requests
	{

	// Cancel appropriate request to socket
	switch (iEngineStatus)
		{
	case EConnecting:
		iEchoSocket.CancelConnect();
		break;
	default:;
		}
	}
/*
 Connect to an Echo Socket by IP address	
*/
 void CTcpEngine::ConnectL(TUint32 aAddr)
	{
	// port number for test purposes - may need to be changed
	iAddress.SetPort(4044);
	iAddress.SetAddress(aAddr);
	iEchoSocket.Connect(iAddress, iStatus);
	iEngineStatus = EConnecting;
	
	SetActive();
	}

/*
Exported function wrapping call to CEchoWrite: writes character to socket
*/
 void CTcpEngine::Write(TChar aChar)
	{
   	/* 
	In this simple implementation, if iEchoWrite is already active, ignore call.
	Full implementation would buffer data 
	*/
	if (iEngineStatus == EConnected)
		IssueWrite(aChar);
	}
/*
Exported function wrapping call to CEchoRead: reads character from socket
*/	
 void CTcpEngine::Read()
	{
	if (iEngineStatus == EConnected) 
		IssueRead();
	}

/*
 Active object request complete handler.
 iEngineStatus flags what request was made, so its
 completion can be handled appropriately
*/
void CTcpEngine::RunL()
	{
	// Cancel TimeOut timer before completion
	_LIT(KConnecting,"\n<CTcpEngine> Connecting\n");
	_LIT(KConnectionFailed,"\n<CTcpEngine> Connection failed");
	_LIT(KDNSFailed,"\n<CTcpEngine> DNS lookup failed");
	_LIT(KTimedOut,"\n<CTcpEngine> Timed out\n");
	_LIT(KDomainName,"\nDomain name = ");
	_LIT(KIPAddress,"\nIP address = ");

	TBuf<15> ipAddr;

	switch(iEngineStatus)
		{
	case EConnecting:
		// IP connection request
		if (iStatus == KErrNone)
		// Connection completed sucessfully
		{
		  		  
			//iEngineStatus = EConnected;
			iBuffer.SetLength(0);
			iBuffer.Append('a');
			iEchoSocket.SendTo(iBuffer,iAddress,NULL,iStatus);
						
			SetActive();
		  	
			
		}
		else
			{
			iEngineStatus = EConnectFailed;
			}
		
		break;
	 case EConnected:
	     	      
		      
	
	    break;
	default:;
		};
	}

CTcpEngine::~CTcpEngine()
	{
	iEchoSocket.Close();
	iSocketServ.Close();
	}

/*
 Shutdown connection request
*/
 void CTcpEngine::Stop()
	{
	_LIT(KETerminate,"\n<CTcpEngine> Terminating\n");

	switch (iEngineStatus)
		{
	case EConnected:
		// Stop live connection
	case EConnecting:
		// if request to CTcpEngine, then stop it
		Cancel();
		break;
	default:;
		}
	}

/*
 Read data from a stream socket
*/
void CTcpEngine::IssueRead()
{
	
	//iEchoSocket.Recv(readBuf, 0, iStatus);
	iEchoSocket.RecvFrom(readBuf, anAddr, 0, iStatus);
	SetActive();
}
	
/*
Write data to a stream socket
*/
void CTcpEngine::IssueWrite(const TChar &aChar)
	{
	// Set up buffer
	iBuffer.SetLength(0);
	iBuffer.Append(aChar);
	iEchoSocket.Write(iBuffer, iStatus);
	SetActive();
	};

Thanks in advance!

[inguvaseshu]

if you want to send some thing out using udp.

dont use """bind""".

use setlocalport(1111) for setting port from which you want to send.

after that use sendto

refer http://discussion.forum.nokia.com/fo...ad.php?t=83191


Regards,
Sheshu Kumar Inguva.

[ambersone]

Hi i have the same problem of gettin the udp datagram packets recvd/send tothe mobile device. with emulator it works fine.

any clues and idea how to ?

[stevenm]

Hello Ambersone,

I wonder if you had the same problem I had.
My app also worked ok on emulator, but on E61 (phone I was testing on) it was no good.

It turned out that I had not allowed the needed "capabilities" for networking.
Had I paid more attention to the debug output for the emulator I would have seen a message about some type of "capability" missing.

As I am using Carbide as my IDE, I just had to add NetworkServices to the Capability line for the project property. I first did this to the mmp file, but I found out later this was the wrong place to do it.

Please note that you will also need to have a correct certificate or, as I did, I turned off in the phone the need for this. This way the user gets a prompt at install time to allow or disallow the install. You will also see at this point what capabilities will be allowed.

I hope that this helps

Steve

[sysctl]

if you want to send some thing out using udp.

dont use """bind""".

use setlocalport(1111) for setting port from which you want to send.

after that use sendto

refer http://discussion.forum.nokia.com/fo...ad.php?t=83191


Regards,
Sheshu Kumar Inguva.

Acutally using Bind is perfectly fine.

[inguvaseshu]

See i have some problem with bind to 0000 for listening to a udp port. instead we can use setLocalPort for listening port.

For sending something out we dont need to bind.

Here may be they have capability problem.

Thanks & Regards,
Sheshu Kumar Inguva.

[rakeshyadav]

Hi,

I am trying to make a UDP Connection to "Server". On Emulator it is working fine(server recieves data), when I try it on N82 it prompts for selecting IAP, but the Server is not recieving anything. I have given it Capability-"NetworkServices" in MMP.
Anyone had any clue what can be the problem. Here is the Code:

iSocket = new RSocket();
	//Address to send UDP
	TSockAddr iSendAddr(TInetAddr(INET_ADDR(72,29,81,250), 4568));
	
	User::LeaveIfError( iSocketServ.Connect());

	User::LeaveIfError(iSocket->Open(iSocketServ, KAfInet, KSockDatagram, KProtocolInetUdp)); 
	
	
	iSocket->SendTo(_L8("Data to send"),iSendAddr,0,iStatus);
	User::WaitForRequest(iStatus);

Thanks in Advance,
Rakesh

[wizard_hu_]

It can be anything. Starting with a firewall for example.