Python3: GATT の Characteristic を調べる

事前に　bluetoothctl で ペアリングをしておく必要があります。

プログラム

get_services.py

#! /usr/bin/python

import asyncio
from bleak import BleakScanner, BleakClient

# 対象デバイスの MAC アドレスを設定
TARGET_MAC_ADDRESS = "2C:BC:BB:65:E8:5A"  # ここに対象デバイスの MAC アドレスを入力

# デバイスをスキャンして、接続後にサービスと characteristic を取得する関数
async def connect_and_list_characteristics():
    print(f"Scanning for device with MAC address: {TARGET_MAC_ADDRESS}")
    
    # BLE デバイスのスキャン
    devices = await BleakScanner.discover(return_adv=True)
    target_device = None
    
    # 指定した MAC アドレスに一致するデバイスを探す
    for device, adv_data in devices.values():
        if device.address == TARGET_MAC_ADDRESS:
            target_device = device
            print(f"Found device with MAC address: {device.address}")
            print(f"  Name: {device.name}")
            print(f"  RSSI: {adv_data.rssi}")
            print(f"  UUIDs: {adv_data.service_uuids}")
            break

    if target_device is None:
        print(f"No device found with MAC address: {TARGET_MAC_ADDRESS}")
        return
    
    # デバイスに接続して GATT サービスと characteristic の UUID を取得
    async with BleakClient(target_device) as client:
        print(f"Connected to {TARGET_MAC_ADDRESS}")
        
        # GATT サービスを取得
#        services = await client.get_services()
        services = client.services
        
        # サービスと characteristic の UUID を列挙
        for service in services:
            print(f"Service: {service.uuid}")
            for characteristic in service.characteristics:
                print(f"  Characteristic: {characteristic.uuid} - Properties: {characteristic.properties}")

if __name__ == "__main__":
    asyncio.run(connect_and_list_characteristics())

実行結果

$ ./get_services.py 
Scanning for device with MAC address: 2C:BC:BB:65:E8:5A
Found device with MAC address: 2C:BC:BB:65:E8:5A
  Name: LV-HATR
  RSSI: -69
  UUIDs: ['7def8317-7300-4ee6-8849-46face74ca2a']
Connected to 2C:BC:BB:65:E8:5A
Service: 00001801-0000-1000-8000-00805f9b34fb
  Characteristic: 00002a05-0000-1000-8000-00805f9b34fb - Properties: ['indicate']
Service: 7def8317-7300-4ee6-8849-46face74ca2a
  Characteristic: 7def8317-7302-4ee6-8849-46face74ca2a - Properties: ['write']
  Characteristic: 7def8317-7301-4ee6-8849-46face74ca2a - Properties: ['read', 'notify']