![]() ![]() In November 2005, 9.5 million BT radios were being shipping each week, 61 by 2012, the number of BT enabled devices shipped to market is expected to reach over 1.8 billion. Paul Braeckel, in Advances in Computers, 2011 5 ConclusionĪmong the wireless technologies, BT's acceptance has exhibited tremendous growth and has the appearance of gaining momentum. A device cannot respond to any inquiries if it is not discoverable. Limited discoverable devices respond to general and limited inquiries. A general discoverable device responds only to general inquiries. A Bluetooth device can be general, limited, or not discoverable. Which devices respond to an inquiry request depends on the discoverable mode of the device. A limited inquiry is similar to asking all people in a room to say their names only if they are accountants. A general inquiry is similar to asking all people in a room to say their names. A limited inquiry is used to find all devices in an area that are discoverable for only a limited length of time. A general inquiry is used to find all the Bluetooth devices in an area. ![]() ![]() The class of device record describes the type of Bluetooth device and provides a general indication of the types of services available on the device.Īt the time of publication, the Bluetooth SIG had defined two types of inquiries: general and limited. The Bluetooth address is a 6-byte unique identifier assigned to every Bluetooth device by the manufacturer. These devices respond with their Bluetooth address and class of device record. When a Bluetooth device issues an inquiry, the other devices in the area respond to the inquiry requests depending on their discoverable mode. In Bluetooth terms, device discovery is known as an inquiry. In the service discovery process, the Bluetooth device determines which services the other devices have running on them. In the device discovery process, the local Bluetooth device finds the other Bluetooth devices in the area. The Bluetooth specification separates discovery of devices and discovery of services into separate processes. ![]() A Bluetooth device must also be able to determine what services are on the devices found. Thompson, in Bluetooth Application Programming with the Java APIs, 2004 6.1 Overviewīecause the typical Bluetooth radio is part of a mobile device, a Bluetooth device must be able to dynamically locate devices within the area. ![]()
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