tailieunhanh - TL Bluetooth

| Bluetooth Bluetooth is the name of a wireless interface standard that uses radio frequency RF as its medium instead of infrared frequency as is used with IrDA. Bluetooth is designed to be a successor to IrDA providing the file transfer capabilities of IrDA along with a number of other capabilities centering on cableless connections. Bluetooth is named for Harald Blâtand Bluetooth who was king of Denmark from 940 to 985. Harald was the grandson of King Ethelred of England and the grandfather of King Canute famous for demonstrating the limits of kingly power by commanding the tide not to come in For those wondering the tide came in anyway. Harald s claim to fame is the unification of Denmark and Norway during his rule. One thousand ten years later following an Ericsson-initiated feasibility study of using a low-power radio frequency network to link peripherals a special interest group SIG was formed with Ericsson IBM Toshiba Nokia and Intel to organize and form a standard under the codename Bluetooth. That catchy code name was soon chosen as the actual name of the standard. Although it has taken longer than expected for Bluetooth-enabled devices to reach the mainstream the number of devices supporting Bluetooth has grown. Following this trend a number of Pocket PC and other Windows CE devices now include support for Bluetooth. Windows CE .NET provides integrated support for the Bluetooth protocol which is also supported by the Pocket PC 2003. Some Pocket PC OEMs use third-party Bluetooth software on their devices instead of the Windows CE stack. This Bluetooth discussion covers only the Windows CE Bluetooth API. To program third-party Bluetooth stacks developers should contact the device manufacturers for information. Bluetooth functionality is centered on profiles that define services provided to the user. Profiles include Cordless Telephony Intercom Headset Fax Dial-Up Networking LAN Access Object Push Synchronization and File Transfer. Not all profiles are .