能否举个例子说明如何在 Bleak 中连接和控制 BLE 设备?
时间: 2024-10-23 21:14:46 浏览: 54
在 Bleak 中连接和控制 BLE 设备通常包括以下步骤:
首先,你需要安装 Bleak 库,如果还没有安装,可以使用 pip 安装:
```bash
pip install bleak
```
然后,你可以通过以下示例演示连接过程:
```python
from bleak import BleakClient
# 替换为你的蓝牙设备地址
device_address = "XX:XX:XX:XX:XX:XX"
def on_connect(client):
print("Connected to", client.address)
async def main():
async with BleakClient(device_address, disconnected=on_disconnect) as client:
await client.is_connected() # 检查是否已经连接
if not await client.connect(): # 尝试连接
print("Failed to connect")
else:
print("Connected successfully")
services = await client.get_services() # 获取设备的所有服务
for service in services:
characteristics = await service.get_characteristics() # 获取服务下的所有特性
for characteristic in characteristics:
await characteristic.read() # 读取特性值
# 根据特性类型处理数据,比如订阅通知或发送数据
# 开始异步任务
if __name__ == "__main__":
loop = asyncio.get_event_loop()
try:
loop.run_until_complete(main())
except KeyboardInterrupt:
pass
finally:
loop.close()
```
在这个例子中,我们创建了 `BleakClient` 对象,尝试连接给定的设备地址。一旦连接成功,我们可以获取设备的服务和特性,然后读取和操作它们。
阅读全文