PyBluez is a Python extension module written in C that provides object-oriented, modular access to system Bluetooth resources. It acts as a wrapper around the BlueZ Linux Bluetooth stack and the Microsoft Bluetooth stack on Windows. It allows developers to scan for devices, discover services, and handle raw data transmission. Key Protocols Supported
RFCOMM: Emulates an RS-232 serial port. This is ideal for streaming data or simple text messaging between devices. It is limited to a maximum of 30 open ports simultaneously.
L2CAP: Provides connection-oriented and connectionless data packets to upper-layer protocols. It supports approximately 15,000 unreserved ports, making it superior for multi-device network topologies (e.g., swarm robotics).
SDP (Service Discovery Protocol): Allows a client application to dynamically search for and discover services offered by a nearby Bluetooth server. Core Mechanics of PyBluez 1. Device Discovery
To communicate with a nearby device, you must find its hardware MAC address, represented as a hexadecimal string (e.g., XX:XX:XX:XX:XX:XX). The discover_devices() method scans the vicinity for roughly 10 seconds.
import bluetooth # Scan for nearby devices nearby_devices = bluetooth.discover_devices(lookup_names=True) for addr, name in nearby_devices: print(f”Found {name} at MAC address: {addr}“) Use code with caution. 2. Creating an RFCOMM Server
A server binds an empty string ”” to listen across all local Bluetooth adapters on a designated port, then waits to accept a client connection. Bluetooth programming with Python – PyBluez
Leave a Reply