One device sends out the inquiry request, and any device listening for such a request will respond with its address, and possibly its name and other information. Inquiry – If two Bluetooth devices know absolutely nothing about each other, one must run an inquiry to try to discover the other.The lower 24-bits are the more unique part of the address. This address should be visible on most Bluetooth devices.Ĭreating a Bluetooth connection between two devices is a multi-step process involving three progressive states: The most-significant half (24 bits) of the address is an organization unique identifier (OUI), which identifies the manufacturer. This will usually be presented in the form of a 12-digit hexadecimal value. Bluetooth Addresses and NamesĮvery single Bluetooth device has a unique 48-bit address, commonly abbreviated BD_ADDR. Any slave device in the piconet can only be connected to a single master. In this model, a single master device can be connected to up to seven different slave devices. Where is Bluetooth Specification available ?ĭownload from How Bluetooth devices communicates ?īluetooth networks (commonly referred to as piconets) use a master/slave model to control when and where devices can send data. There is a standardized set of rules and specifications that differentiates it from other protocols. The Bluetooth protocol operates at 2.4GHz in the same unlicensed ISM frequency band where RF protocols like ZigBee and WiFi also exist. It’s a secure protocol, and it’s perfect for short-range, low-power, low-cost, wireless transmissions between electronic devices. Bluetooth is a standardized protocol for sending and receiving data via a 2.4GHz wireless link.

Bluetooth protocol for mac via homebrew