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Thursday, 28 March 2019

Bluetooth in IoT

Introduction
  • Bluetooth wireless technology is a short range communications technology.
  • Intended for replacing cables connecting portable units.
  • Maintains high levels of security.
  • Bluetooth technology is based on Ad-hoc technology also known as Ad-hoc Piconets.
Features
  • Bluetooth technology operates in the unlicensed industrial, scientific and medical (ISM) band at 2.4 to 2.485 GHZ.
  • Uses spread spectrum hopping, full-duplex signal at a nominal rate of 1600 hops/sec.
  • Bluetooth supports 1 Mbps data rate for version 1.2 and 3Mbps data rate for Version 2.0 combined with Error Data Rate.
  • Bluetooth operating range depends on the device:
         - Class 3 radios have a range of up to 1 meter or 3 feet
         - Class 2 radios are most commonly found in mobile devices have a range of 10 meters or 30 feet
         - Class 1 radios are used primarily in industrial use cases have a range of 100 meters or 300 feet.

Connection Establishment

Inquiry run by one Bluetooth device to try to discover other devices near it.

Process of forming a connection between two Bluetooth devices.

A device either actively participates in the network or enters a low-power sleep mode.

Modes




Protocol Stack



Baseband

Physical layer of the Bluetooth.
Manages physical channels and links.
Other services include:
   - Error correction
   - Data whitening
   - Hop selection
   - Bluetooth security
Manages asynchronous and synchronous links.
Handles packets, paging and inquiry.


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