Re: Socket Disconnect

From: MDB (nospam)
Date: 08/31/04 

Date: Tue, 31 Aug 2004 11:39:58 -0400

First thanks for your reply however, how do you set the SetSocketOption
using the compactframework? I have tried several different ways only to
receive errors when the code is ran (not when compiled).

"Paul G. Tobey [eMVP]" <ptobey no spam AT no instrument no spam DOT com>
wrote in message news:%23VvG762jEHA.1904@TK2MSFTNGP09.phx.gbl...
> To notice that a connection has been broken, you either have to try to
send
> something over the socket or you have to tell the network stack to do it
for
> you. That is, if you are periodically sending packets, you'll find out
> roughly two minutes after you send the first packet after the other device
> dies that the connection is broken. In that case, the stack will detect
> that there has been no acknowledgement. It will retry a number of times,
> but, when all of those attempts fail, it will close the socket and you'll
> get an error/exception.
>
> If you are sitting around waiting to receive packets, though, you'll never
> realize that the other end of the socket is gone, unless you tell the
stack
> to use keep-alive packets. When you turn that on, the network stack, when
> it detects a long period of inactivity, will periodically send a packet to
> the other end of the connection. If it replies, the stack goes back to
> sleep. If it fails to reply, it will retry, in a certain pattern and, if
> there is still no reply, will close the socket.
>
> You have to tell your sockets to use keep-alives, using the
SetSocketOption
> code KeepAlive.
>
> Note that, even if keep-alives are on, the default idle time before
sending
> them is 2 hours...
>
> Paul T.
>
> "MDB" <nospam> wrote in message
> news:ui5tYo2jEHA.1404@TK2MSFTNGP09.phx.gbl...
> > Hello All, I am using the below code to create a socket connection via
> > wi-fi to another device. The problem is that if the device I am
> > connecting
> > to losing power and reboots I lose the socket connection however, my
> > device
> > dosn't know it was dropped and dosn't receive any type of error when it
> > sends messages. From what I have read, CF dosn't support
SetSocketOption
> > so my question is does anyone know of a good way to work around this?
> >
> >
> > ****SocketConnect****
> > g_socClient = new Socket (AddressFamily.InterNetwork,SocketType.Stream
> > ,ProtocolType.Tcp );
> > IPAddress ip = IPAddress.Parse (strRemoteIPBase);
> > IPEndPoint ipEnd = new IPEndPoint (ip,intTCPListenPort);
> > g_socClient.Connect ( ipEnd );
> >
> > WaitForData();
> >
> >
> >
> > ****WaitForData ****
> >
> > if ( pfnCallBack == null )
> > {
> > pfnCallBack = new AsyncCallback (OnDataReceived);
> > }
> > CSocketPacket theSocPkt = new CSocketPacket ();
> > theSocPkt.thisSocket = PMMobile.Classes.Globals.g_socClient;
> >
> > m_asynResult = g_socClient.BeginReceive (theSocPkt.dataBuffer
> > ,0,theSocPkt.dataBuffer.Length ,SocketFlags.None,pfnCallBack,theSocPkt);
> >
> >
>
>

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