BlueGate 1000
Appendix—A, Intro to BT
May 8, 2001
WIDCOMM, Inc, Proprietary and Confidential
A-6
Device Inquiry and Service Discovery
To connect to a remote Bluetooth device, the remote device must:
•
Be within radio range.
•
Provide a Bluetooth service.
•
Be accessible, from a security standpoint, by the local device.
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Device Inquiry
A Bluetooth device must be within radio range of a second Bluetooth device to establish
a connection.
Every Bluetooth device keeps a list that contains the user-friendly name and device
address of each remote device that is within its radio range.
As Bluetooth devices wander in and out of the Bluetooth Neighborhood the list must be
updated. This is accomplished in two ways:
•
The list is updated automatically when the local device periodically queries all
other Bluetooth devices within range.
•
The list can also be updated as necessary by selecting an on-screen option.
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Service Discovery
Even though a device is within radio range the local device will not be able connect to it
if the remote device does not provide the requested service.
Service Discovery is the process of determining which Bluetooth services are available
on the devices within radio range.
Connection requests are made for a specific service. If the desired service is the File
Transfer Protocol (FTP) and the remote device does not offer that service, the connection
will not be allowed.
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Security
The security parameters of the remote device must be set to allow the local device to
establish a connection.
Even though there is a remote device in the Bluetooth Neighborhood that provides the
desired service, the remote device security parameters may be set to allow only specific
devices to connect. If the requesting device is not on that list, it will not be allowed to
connect.
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