How to Create an Explicitly Bound Socket

This topic describes how create an explicitly bound socket.

Steps

1. Open a socket and bind the socket to a network interface connection.

   Example:

   • Call RSocket::Open() and pass an RConnection.

     RConnection binds to an interface corresponding to the RConnection.

     In the following example code, if iConn corresponds to a WiFi RConnection then, after a calling RSocket::Open() the socket is explicitly bound to WiFi.

     iRecvSock.Open( ss, KAfInet, KSockStream, KProtocolInetTcp, iConn );

2. Open a socket and bind the socket to an IP address of the network interface connection.

   Example:

   • Call RSocket::Bind() and bind the socket to an IP address of the network interface connection.

     RSocket::Bind() binds the socket to a unique IP address of the network interface connection.

     The following example code shows how to open a socket and bind the socket to a unique IP address of the WiFi connection.

     // open an implicit socket
     TInt err = iRecvSock.Open( iSs, KAfInet, KSockDatagram, KProtocolInetUdp); 
     User::LeaveIfError( err );
     // This IP address maps to WiFi in the ced.cfg file
     _LIT(KRasAddr,"192.168.220.4");
     const TInt KPort = 7000;
     TInetAddr addr;
     err = addr.Input( KRasAddr ); 
     User::LeaveIfError( err );
     addr.SetPort( KPort );
     // Now the socket is explicitly bound to WiFi  
     err = iRecvSock.Bind( addr ); 
     RDebug::Print( _L("testapp: ETH Bind() = %d"), err ); 
     User::LeaveIfError( err );
     

   The following code block shows an extract from the ced.cfg file.

   ## 
   [LANService]
   ADD_SECTION
   # COMMDB_ID = 1
   Name=Ethernet
   IfNetworks=ip
   IpNetMask=255.0.0.0
   IpGateway=0.0.0.0
   IpAddrFromServer=FALSE
   IpAddr=192.168.1.1
   IpDNSAddrFromServer=FALSE
   ConfigDaemonManagerName=NetCfgExtnDhcp
   ConfigDaemonName=!DhcpServ
   FIELD_COUNT=9
   END_ADD
   
   ADD_SECTION
   # COMMDB_ID = 2
   Name=Ethernet WiFi
   IfNetworks=ip
   IpNetMask=255.0.0.0
   IpGateway=0.0.0.0
   IpAddrFromServer=FALSE
   -// This IP address maps to WiFi
   IpAddr=192.168.220.4
   IpDNSAddrFromServer=FALSE
   IpNameServer1=194.72.6.51
   IpNameServer2=194.72.6.52
   ConfigDaemonManagerName=NetCfgExtnDhcp
   ConfigDaemonName=!DhcpServ
   LanServiceExtensionTableName=WLANServiceExtensionTable
   LanServiceExtensionTableRecordId=4
   FIELD_COUNT=13
   END_ADD
   

Explicit binding example

Client A creates a socket with explicit binding using the specified interface connection.

sock1 = RSocket.Open(srv,conn);

ESock creates the socket within the default connection and subconnection.