Bluetooth Low Energy (BLE) is a wireless communication technology that allows devices to connect and exchange data over short distances. BLE uses advertising packets to broadcast information about a device’s presence and capabilities to nearby devices. In this article, we will explore what BLE advertising packets are, how they work, and their role in BLE communication.
What are Advertising Packets?
BLE advertising packets are small packets of data that are broadcast by BLE devices to announce their presence and advertise their capabilities. Advertising packets typically contain information such as the device name, unique identifier, service UUIDs, and other relevant data. These packets are transmitted periodically at regular intervals, at a frequency determined by the advertising interval parameter.
How do Advertising Packets Work?
Advertising packets work by transmitting data over specific advertising channels that are reserved for BLE communication. The advertising channels operate in the 2.4 GHz ISM band with a channel spacing of 2 MHz. There are three advertising channels available in most regions, but some regions allow for additional channels.
BLE devices can transmit advertising packets on one or more advertising channels simultaneously. This helps increase the chances of the packet being received by nearby devices. Advertising packets are transmitted using frequency hopping spread spectrum (FHSS) to minimize interference and improve reliability.
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