Connecting -and Transferring Data to a Remote Device

How to Communicate with a Remote Device

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.

Where Next?

This tutorial set takes you through -all the steps involved in setting up and communicating over a Bluetooth connection.

Selecting -a Remote Device
Inquiring -About Remote Devices
Inquiring -About Services on a Remote Device
Connecting and Transferring -Data to a Remote Device - This document
Using -security on outgoing sockets

+ + + + + +Connecting +and Transferring Data to a Remote DeviceOnce the device and service have been established, you can connect +to the remote service and start using it. +

How to Communicate with a Remote Device

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.

Where Next?

This tutorial set takes you through +all the steps involved in setting up and communicating over a Bluetooth connection.

Selecting +a Remote Device
Inquiring +About Remote Devices
Inquiring +About Services on a Remote Device
Connecting and Transferring +Data to a Remote Device - This document
Using +security on outgoing sockets

\ No newline at end of file