Once the device and service have been established, you can connect to the remote service and start using it.
Connect
to the device through the Connect() function of the generic
Symbian platform socket interface RSocket.
Bluetooth sockets can be opened using the L2CAP and RFCOMM protocols. For
an L2CAP Bluetooth socket, the "port" is the Protocol/Service Multiplexer
(PSM) to which to connect; for an RFCOMM the port is the server channel. Where
these values are not known, they can be read from the service attribute ProtocolDescriptorList.
See Using Bluetooth
Service Discovery Agent for details.
You can read and write data using the socket in whatever format the target service expects (AT commands, text, HTTP, PPP etc).
Example
// Assume have a TInquirySockAddr object, addr, with relevant device info
// Connect an L2CAP socket
RSocket socket;
// although CBluetoothSocket may be a better option.
RSocketServ socketServ;
TRequestStatus status;
User::LeaveIfError(socket.Open(socketServ,KBTAddrFamily,KSockSeqPacket,KL2CAP));
User::LeaveIfError(socket.Connect(addr,status));
User::WaitForRequest(status);
if (status == KErrNone)
{
// Write some simple data
_LIT8(KDataToWrite,"01234");
socket.Write(KDataToWrite,status);
User::WaitForRequest(status);
}
// Close socket
socket.Close();
Notes
For both the RFCOMM
and L2CAP protocols, no data can be sent or received in the Connect() and Shutdown() calls. The versions of these calls that
take extra data panic.
RFCOMM uses sockets
of the stream socket (KSockStream) type.
L2CAP uses sockets of
the sequenced packet (KSockSeqPacket)
type.