Problem with start_notify, bleak

• bleak version: 0.14.3
• Python version: 3.9.12
• Operating System: macOS 10.15.7

Hi! I have to read the weight from a Mi Smart Scale 2 scale via Mac.

The weight is encoded in a BLE characteristic. However, sometimes it reads the weight, other times it doesn’t.

I’m using the code found in the Bleak repository examples and this is my code:

import sys
import asyncio
import platform

from bleak import BleakClient

CHARACTERISTIC_UUID = "00002a9d-0000-1000-8000-00805f9b34fb"
ADDRESS = (
    "70:87:9e:0f:f8:7d"
    if platform.system() != "Darwin"
    else "775A199B-A238-4AB7-86EB-4EFF8C404F9A"
)


def notification_handler(sender, data):
    """Simple notification handler which prints the data received."""
    data1 = list(data)
    data2 = ((data1[1]+data1[2]*256)*0.005)
    print("{0}: {1}".format(sender, data2))


async def main(address, char_uuid):
    async with BleakClient(address) as client:
        print(f"Connected: {client.is_connected}")

       
        await client.start_notify(char_uuid, notification_handler)
        await asyncio.sleep(30.0)
        await client.stop_notify(char_uuid)
        


if __name__ == "__main__":
    asyncio.run(
        main(
            sys.argv[1] if len(sys.argv) > 1 else ADDRESS,
            sys.argv[2] if len(sys.argv) > 2 else CHARACTERISTIC_UUID,
        )
    )

[dlech]

tried to install Xcode to acquire bluetooth packets but I don’t have enough memory space

You don’t need to install XCode, just the hardware utilities from the apple developer website

I think the problem is related to caches or in general to the saving session… What do you think about it?

If the device is listed in the Bluetooth system settings, try removing it there.

[dlech]

Have you tried the troubleshooting recommendations in the Bleak docs (enable logging, capturing Bluetooth packets)?