TCP server packet receiving problem

[raj_rr7]

Hi All,

I am new to Symbian and working on 9.1 and Series 60 SDK. I am creating a sample TCP client server application using Active object for emulator.

The procedure for client server communication is as following
1) TCP server socket is created.
2) Once created it listen to incoming connect request.
3) TCP client socket is created and try to connect to TCP server socket.
4) TCP server creates a service socket and accept the connection request.
5) TCP client sends packet on connected socket to TCP server
6) Here TCP server socker does not get any packets. Its RunL function is never called.

The code is shown below

TCP CLIENT:
_________________________________________________________________
Socket creation and connecting code
{
//Destination port
const TInt KEchoPort = 1234;
//Destination ip address
const TUint32 KInetAddr = INET_ADDR(127,0,0,1);
//Destination addres as InetAddr format
TInetAddr destAddr;

//Connect Server Socket
if( KErrNone != ssCli.Connect())
{
CEikonEnv::Static()->AlertWin(_L("Fail to Connect SerSocket"));
}

//Open client socket
if( KErrNone != sockCli.Open(ssCli, KAfInet, KSockStream, KProtocolInetTcp))
{
CEikonEnv::Static()->AlertWin(_L("Fail to Open Client Socket"));
}

//Set destination address
destAddr.SetFamily(KAfInet);
destAddr.SetAddress(KInetAddr);
destAddr.SetPort(KEchoPort);

//Send packet but do not wait to let the task complete
sockCli.Connect(destAddr,iStatus);
//Changing the state of socket to Connecting
iState = Connecting;
SetActive();
}
RunL for client is called on successful connection to server

Packet sending code:
{
TBuf8<256> iWrite(_L8("abcdefghijklmnopqrstuvwxyz"));
//Send packet but do not wait to let the task complete
sockCli.Send(iWrite,NULL,iStatus);
//Changing the state of socket to Sending
iState = Sending;
SetActive();
}
RunL for client is called on successful packet sending.
_________________________________________________________________

TCP SERVER:
_________________________________________________________________
Socket creation and listening code
{
//Error number buffer
TBuf<32> errNo;
//Error code
TInt errCode;
//Destination port
const TInt KEchoPort = 1234;
//Destination ip address
const TUint32 KInetAddr = INET_ADDR(127,0,0,1);
//Destination addres as InetAddr format
TInetAddr anAddr;

//Connect Server Socket
if( KErrNone != ssSer.Connect())
{
CEikonEnv::Static()->AlertWin(_L("Fail to Connect SerSocket"));
}

//Open client socket
if( KErrNone != sockSer.Open(ssSer, KAfInet, KSockStream, KProtocolInetTcp))
{
CEikonEnv::Static()->AlertWin(_L("Fail to Open Client Socket"));
}

//Set source address to which client will bind
anAddr.SetFamily(KAfInet);
anAddr.SetAddress(KInetAddr);
anAddr.SetPort(KEchoPort);

CEikonEnv::Static()->AlertWin(_L("Binding"));
//Bind socket to source address
errCode = sockSer.Bind(anAddr);
errNo.Num(errCode);
CEikonEnv::Static()->AlertWin(errNo);

if( KErrNone != errCode )
{
CEikonEnv::Static()->AlertWin(_L("Fail to Bind Socket"));
}

CEikonEnv::Static()->AlertWin(_L("Listening"));
//Listen socket for incoming request
User::LeaveIfError(sockSer.Listen(1));

CEikonEnv::Static()->AlertWin(_L("Accepting"));
//Aceepting request and creating a new service socket
sockBlank.Open(ssSer);
sockSer.Accept(sockBlank,iStatus);
//Change the socket status to Accepting
iState = Accepting;
SetActive();
}
RunL for server is called on successful accepting of client request

Packet receiving code:
{
sockBlank.Recv(iRecv,NULL,iStatus);
//Change the socket status to Receiving
iState = Receiving;
SetActive();
}
This code is executed successfully. But no call back is received in RunL of server active object
_________________________________________________________________

Does anybody has observed such behavior? Please provide guidence to trace the issue.


Thanks & Regards
Rajat

[abolfoooud]

Hi,

I am facing the same problem as yours. i got some disappointing replies in the thread below
http://discussion.forum.nokia.com/fo...d.php?t=108935
i am still haunting on the chanmps here to help me get over it maybe you will be saved as well. so watch it out

by teh way i dont think you are getting the IP address part for the server correct. you need to enquire about the proper address allocated to your server app by your operator using the GetIp() function in the link above. Also i think you need not to worry about the Ip address for the client. Just use KInetAddrAny.

Best
AF

[raj_rr7]

Hi,

Thanks for the reply. I just want to know that use of IAP/Id is necessary while creating TCP server client application for Emulator. I am new to symbian so not sure for that.

When i am creating an application to work in localhost 127.0.0.1 do i need to get the IP address? As i am able to connect to TCP server socket from TCP client but the packet send from client is not recevied by server.

Please correct me if i am wrong.

Thanks
Rajat

[yunusrf]

HI Rajat,

Did you got the solution for he above problem.I too facing the same problem.TCP server socker does not get any packets. Its RunL function is never called.Though the server is able to send packets to client and also the server is notified when the client get's dis connected.But unable to get packets from Clint.I am using Cobain (Bluetooth communications API) framework (for Symbian9.x+ environment ) . The COBAIN site claims to have not tested the listening code properly but I did not found any problems with the logic as such.

Please help me if you found solution for this similar problem.

Thanks
Yunus

[yunusrf]

Hi,
Any Nokia champion's can help here ? . I am using Series60 3rd Edition and using .NET 2003 with Carbide.vs. I am testing using the Emulator. Any special settingson the Emulator needs to be done to resolve the above problem.Expecting feedback from Nokia champions.

Thanks
Yunus

[yunusrf]

Hi All,
I got the solution for this problem.The issue was my wrong interpreatation of the API :
void Read(TDes8 &aDesc, TRequestStatus &aStatus);

Please read below documentation of this API:

For a stream-interfaced sockets, the function only completes when the full amount of requested data has been received (or the connection breaks). This means when the descriptor has been filled to its maximum length (not its current length).

i.e RunL will be called only after descriptor has been filled to its maximum length.

Thanks
Yunus

[wizard_hu_]

That is correct. If you want to receive arbitrary-sized data chunks, you should better use RecvOneOrMore, and concatenate the pieces.

[vxml team]

hi all
please help me.
I am creating a sample TCP server.
I use the code above and use "RecvOneOrMore",
but i got a error "kern-exec 3" on the emulator.
please tell me how to solve it?
And someone can give me a complete example about tcp or udp server?

thanks a lot

[wizard_hu_]

If you initiate a search for word RSocket in the Examples and/or Series60Ex (or S60Ex) directory of your SDK, you will find something. For example Chat example in 3rd edition SDK-s.

[vxml team]

Thank you for your reply.
The example I have looked.
May you give me other examples??

thanks a lot