How bluetooth communication works   Bluetooth headset speaker

Bluetooth technology is a universal wireless communication standard that has been applied to all walks of life, covering more than 96% of mobile phones in the world. It can be connected to any related device within a short distance, becoming the Internet of Things (IOT ) one of the main technologies. Here's an answer to how the ubiquitous Bluetooth technology works. www.bjbjaudio.com

Bluetooth devices use radio waves with a frequency of 2.4GHz to connect mobile phones and computers. A Bluetooth product consists of a small Bluetooth module as well as a Bluetooth radio and software to support the connection. When two Bluetooth devices want to communicate with each other , they need to be paired. Communication between Bluetooth devices takes place in a short-range ad hoc network (a network where devices are connected using Bluetooth technology). This network can accommodate multiple Bluetooth devices to connect. When the network environment is successfully created , one device acts as the master device, and all other devices act as slave devices. This temporarily established network after pairing will dynamically and automatically re-establish contact as Bluetooth devices join and leave radio short-range sensing. www.bjbjaudio.com

Different Classes of Bluetooth Technology
Bluetooth technology can be divided into several categories according to different core specifications. Currently the most common are Bluetooth BR/EDR (ie Basic Rate/Enhanced Data Rate) and Bluetooth Low Energy (BLE) technologies
Bluetooth BR/EDR technology - establishes a relatively short-range, continuous wireless connection, ideal for use cases such as audio streaming;
Bluetooth Low Energy (BLE) - allows fast, relatively long-range wireless connections, ideal for Internet of Things (IoT) applications that do not require constant connections and require long battery life; www.bjbjaudio.com

What are the applications of Bluetooth technology?
Bluetooth BR/EDR is mainly used in Bluetooth version 2.0/2.1, generally used in products such as speakers and headphones; while low-power Bluetooth technology is mainly used in Bluetooth version 4.0/4.1/4.2. For example, Bluetooth low energy technology can connect door locks, lights, TVs, toys, automotive electronics, medical equipment, sports equipment, and almost everything imaginable with Bluetooth.
As a timeless technology, Bluetooth applications based on mobile platforms have brought great practical and convenient advantages to the entire wireless market. Bluetooth still maintains strong vitality and competitiveness, allowing more people to understand and familiarize themselves with the beauty of Bluetooth. In the future, the application of Bluetooth technology will expand in more directions with the needs of the market and the creative design of R&D personnel. www.bjbjaudio.com 

Master and Slave of Bluetooth Communication 
Bluetooth technology stipulates that when Bluetooth communication is performed between each pair of devices, one must be the master role and the other must be the slave role to communicate. During communication, the master must search and initiate pairing. After the link is successfully established, both parties will be Data can be sent and received. In theory, a Bluetooth master device can communicate with 7 Bluetooth slave devices at the same time. A device with Bluetooth communication function can switch between two roles. It usually works in slave mode, waiting for other master devices to connect. When needed, it switches to master mode and initiates calls to other devices. When a bluetooth device initiates a call in the master mode, it needs to know the other party's bluetooth address, pairing password and other information. After the pairing is completed, the call can be initiated directly. www.bjbjaudio.com