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<concept xml:lang="en" id="GUID-FDA7B932-B9C6-502D-8699-C18C8D86BCC6"><title>Performing Low-level Configuration</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>The Bluetooth specification defines commands and options that can be used with the various layers of the protocol. </p> <section><title>How to perform low-level configuration</title> <p>The Bluetooth Sockets API provides some of the commands and options for configuring Sockets at various layers as described below: </p> <p><b>Socket Configuration Options</b> </p> <p>The following Socket configuration options are provided by the Bluetooth Sockets API: </p> <ol id="GUID-B0C63411-0EE7-5307-9E5A-E2CDF05CC6C4"><li id="GUID-7BF0FF43-8ABE-5026-8632-D710D0B9EF97"><p> <b>Host Controller Interface (HCI) commands</b>: provide a command interface to the baseband controller and link manager. These are provided through asynchronous I/O control (ioctl) commands on an L2CAP or RFCOMM socket, as there is no direct Symbian OS interface to the HCI. Ioctls are issued through <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita#GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0/GUID-1DEB83AF-C681-30D4-951C-4C2A5572E59C"><apiname>RSocket::Ioctl()</apiname></xref>. For details, see the reference for the <codeph>KHCIxxx</codeph> constants, such as <xref href="GUID-754AB23A-BA33-384C-81CF-FC6A84B94D16.dita"><apiname>KHCIAddSCOConnIoctl</apiname></xref>. </p> </li> <li id="GUID-42F05040-48EE-522D-8358-F0E290F60B17"><p> <b>L2CAP-level options</b>: these are also issued through ioctls on an L2CAP socket. For details, see the reference for the <codeph>KL2CAPxxx</codeph> constants, such as <xref href="GUID-8E3F3CDF-078E-3E0A-B5E1-5B5D64E12F50.dita"><apiname>KL2CAPEchoRequestIoctl</apiname></xref>. </p> </li> <li id="GUID-DD573402-37EC-5597-A5B2-D90AF33A15C1"><p> <b>RFCOMM commands and options</b>: these are issued through ioctls on an RFCOMM socket, and sockets option settings (<xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita#GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0/GUID-F6BB908A-2E57-3259-8F7F-AC089C6D0C56"><apiname>RSocket::GetOpt()</apiname></xref> and <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita#GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0/GUID-F6BB908A-2E57-3259-8F7F-AC089C6D0C56"><apiname>RSocket::GetOpt()</apiname></xref>). For details, see the reference for the <codeph>KRFCOMMxxx</codeph> constants, such as <xref href="GUID-4C9AAC3D-12A1-3DFC-837F-97BE009B24A9.dita"><apiname>KRFCOMMModemStatusCmdIoctl</apiname></xref>. </p> </li> </ol> <p><b>Example: Reading L2CAP Socket Class of Device</b> </p> <p>The following example shows the HCI command Read_Class_of_Device being issued on an L2CAP socket. The ioctl for this is <xref href="GUID-BFFD4B1A-78F6-346C-A195-D34317382A47.dita"><apiname>KHCIReadDeviceClassIoctl</apiname></xref>, which returns a <xref href="GUID-A20B8F64-51BC-31C8-AC43-80AA6F3C5BBE.dita"><apiname>THCIDeviceClassIoctl</apiname></xref> object packaged in a <xref href="GUID-6649CEA7-2307-32E3-8474-346B11E57DEE.dita"><apiname>THCIDeviceClassBuf</apiname></xref> package buffer. The example extracts the device class into a variable <codeph>majorClass</codeph>. </p> <codeblock id="GUID-EEF819B3-DFA3-5FA4-B1B3-BC6975433656" xml:space="preserve">THCIDeviceClassBuf codbuf;
TRequestStatus status;
socket.Ioctl(KHCIReadDeviceClassIoctl, status, &amp;codbuf, KSolBtHCI);
User::WaitForRequest(status);
TUint16 majorClass = codbuf().iMajorDeviceClass;
</codeblock> </section> <section><title>Where Next?</title> <p>This tutorial set takes you through all the steps involved in setting up and communicating over a Bluetooth connection. </p> <ul><li id="GUID-7C78114A-C780-54D0-916C-179B63BFDA17"><p> <xref href="GUID-70339E6A-63CD-5A74-846C-50771FDAC763.dita">Listening for Incoming Bluetooth Connections</xref>  </p> </li> <li id="GUID-D502FBFF-0B64-53E8-8CDE-58E75BF921A0"><p> <xref href="GUID-834BD3BB-B39C-5EE9-8A62-9DC435930F95.dita">Handling the Local Device Name</xref>  </p> </li> <li id="GUID-F6417852-20EF-5287-AE48-A7A3CBD07502"><p> <b>Performing Low-level Configuration</b> - This document </p> </li> <li id="GUID-51BBC780-11ED-57E9-A9F5-F6A202400FF7"><p> <xref href="GUID-5C63EF5C-826D-5838-BB7E-12FF4EA1DFCE.dita">Debugging the Host Controller</xref>  </p> </li> <li id="GUID-699728A1-AE3F-5BA4-9B16-12EDC458E215"><p> <xref href="GUID-01A0682A-50B1-57AB-9939-6CC8FCCD782D.dita">Disconnecting ACL links</xref>  </p> </li> </ul> </section> </conbody></concept>