ble广播实现计数和开机时间代码示例

BLE（蓝牙低功耗）广播通常用于设备之间的非连接式通信，如设备提供数据或者状态信息。在实现计数和开机时间的代码示例中，我们可能会利用BLE的广告数据区域来存储这些信息。这里给出一个简单的Python示例，使用PyBluez库，假设你有一个名为`MyAdvert`的自定义广告类：

from bleak import BleakScanner, BleakClient

class MyAdvert:
    ADVERT_TYPE_UUID = "0xXXXX"  # 这里替换为你的UUID
    COUNT_KEY = "__COUNT__"
    STARTUP_TIME_KEY = "__STARTUP__"

    def __init__(self):
        self.count = 0
        self.startup_time = None

    def increment_count(self):
        self.count += 1
        if not self.startup_time:
            self.startup_time = datetime.now()

    def build_advertisement_data(self):
        data = {self.COUNT_KEY: str(self.count)}
        if self.startup_time:
            data[self.STARTUP_TIME_KEY] = f"{self.startup_time.timestamp()}"
        return bytes(data)

    def send_advertisement(self, client):
        advertisement_data = self.build_advertisement_data()
        advertisement = Advertisement(
            local_name="YourDeviceName", manufacturer_data=advertisement_data
        )
        client.send(advertisement)


def main():
    scanner = BleakScanner()
    devices = scanner.discover()
    
    for device in devices:
        if device.name == "YourDeviceName":  # 替换为你设备的实际名称
            print(f"Connecting to {device.address}")
            with BleakClient(device.address) as client:
                advert = MyAdvert()
                while True:
                    advert.increment_count()
                    advert.send_advertisement(client)
                    time.sleep(5)  # 每隔5秒发送一次

if __name__ == "__main__":
    main()

在这个示例中，`MyAdvert`类负责维护计数和开机时间，并通过BLE广播将它们更新到广告数据中。`main`函数会扫描附近的设备并连接到指定的设备，然后不断地更新并发送广告。