Smart Home Automation: Project Report (Electronics Project Report Book 1) by Gupta Er. Vivek

Author:Gupta, Er. Vivek [Gupta, Er. Vivek]
Language: eng
Format: epub
Publisher: eruditersClub
Published: 2020-05-23T16:00:00+00:00

Bluetooth protocols simplify the discovery and setup of services between devices. Bluetooth devices can advertise all of the services they provide. This makes using services easier, because more of the security, network address and permission configuration can be automated than with many other network types.

Pairing mechanisms

Pairing mechanisms changed significantly with the introduction of Secure Simple Pairing in Bluetooth v2.1. The following summarizes the pairing mechanisms:

Legacy pairing : This is the only method available in Bluetooth v2.0 and before. Each device must enter a PIN code; pairing is only successful if both devices enter the same PIN code. Any 16-byte UTF-8 string may be used as a PIN code; however, not all devices may be capable of entering all possible PIN codes.

Limited input devices : The obvious example of this class of device is a Bluetooth Hands-free headset, which generally have few inputs. These devices usually have a fixed PIN , for example "0000" or "1234", that are hard-coded into the device.

Numeric input devices : Mobile phones are classic examples of these devices. They allow a user to enter a numeric value up to 16 digits in length.

Alpha-numeric input devices : PCs and smartphones are examples of these devices. They allow a user to enter full UTF-8 text as a PIN code. If pairing with a less capable device the user must be aware of the input limitations on the other device, there is no mechanism available for a capable device to determine how it should limit the available input a user may use.

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