Find my phone bluetooth with my lopy4

[M m]

Hello!!

I'm trying to scan the bluetooth devices that are near me (my lopy).

After reading this, I'm doing the following:

bluetooth_devices = []
global_values.bluetooth.start_scan(5)
while global_values.bluetooth.isscanning():
    adv = global_values.bluetooth.get_adv()
    if adv:
        if adv[0] not in bluetooth_devices:
            # 0: mac, 1: addr_type, 2: adv_type, 3: rssi, 4: data
            bluetooth_devices.append(adv[0])

if len(bluetooth_devices) > 0:
        for dev in bluetooth_devices:
            print('\t',ubinascii.hexlify(dev),'    ', dev)

The problem is that prints some values (I suppose that are devices) but are not appearing neither of my two cell phones (obviously the bluetooth is connected). I know they are not appearing because I know the MAC of my cell phones,

This would be one of them,

I'm doing it wrong? I'm not printing the MAC address? Seems easy, but I can't achieve it.

Thank you very much! I love the device!

[M m]

@jcaron Hello I'm here again, I was trying solving it without disturbing you but I can't understand how it works.

I downloaded a few apps to advertise, but nothing solves my problem.

To understand it more, I thought start using another lopy4 as an advertiser. I used this code:

from network import Bluetooth

bluetooth = Bluetooth()
bluetooth.set_advertisement(name='LoPyNA', manufacturer_data="lopy_v1", service_uuid=b'1234567890123456')

def conn_cb (bt_o):
    events = bt_o.events()   # this method returns the flags and clears the internal registry
    if events & Bluetooth.CLIENT_CONNECTED:
        print("Client connected")
    elif events & Bluetooth.CLIENT_DISCONNECTED:
        print("Client disconnected")

bluetooth.callback(trigger=Bluetooth.CLIENT_CONNECTED | Bluetooth.CLIENT_DISCONNECTED, handler=conn_cb)
bluetooth.advertise(True)

Now I come back to my first lopy with the BLE scanner and this is what I obtain:

• Mac: b'30aea474bc8e'.
• Data: b'02010607094c6f50794e41020aeb05122000400002010608ff6c6f70795f7631110731323334353637383930313233343536000000000000000000000000'.
• Adv name: LoPyNA.

Thus, my code is working fine because I can find BLE devices. But not good enough because it can't find my two cell phones or my computer (or if it does, I'm unable to recognize them).

Some suggestion or idea?

Thank you very much!

[jcaron]

@M-m What are you doing to make the phone advertise? IIRC most phones don't advertise by default (the pages for discovery, pairing, etc. are usually for classic BT, not BLE). You need an app that explicitly starts advertising, and then you can usually control what they advertise.

[M m]

@livius

• Are you phones advertising in the moment of scan?
  - Yes, I need to be on a specific screen and yes I am on it.

• And more wide question are then some new or old one?
  - They are Bluetooth 4.2. If I'm not wrong, BLE starts at version 4.0

• You can also increase timeout from 5 to e.g. 20.
  - I did it and nothing changes.

• And are you sure that you look at proper MAC address?
  - 100% sure. If you see the image in my question, is a screenshot of my bluetooth characteristics and says in Spanish "Dirección de Bluetooth" that means Bluetooth direction.

@jcaron

Thinking about this, I have two values about my phones. Example:

• MAC direction: B4F1DAC0171C.
• Bluetooth name: Q6 (in hex 5136)

Can I use one of the two to find my phones?

I tried this, but it doesn't solve anything for me.

bluetooth_devices = []
global_values.bluetooth.start_scan(30)
while global_values.bluetooth.isscanning():
    adv = global_values.bluetooth.get_adv()
    if adv and adv[0] not in bluetooth_devices:
        print('>>1  ',global_values.bluetooth.resolve_adv_data(adv.data, Bluetooth.ADV_NAME_CMPL))
        try:
            print('>>2a ',ubinascii.hexlify(global_values.bluetooth.resolve_adv_data(adv.data, Bluetooth.ADV_MANUFACTURER_DATA)))
        except:
            print('>>2b ',global_values.bluetooth.resolve_adv_data(adv.data, Bluetooth.ADV_MANUFACTURER_DATA))
        # 0: mac, 1: addr_type, 2: adv_type, 3: rssi, 4: data
        print(adv[0])
        print(adv[1])
        print(adv[2])
        print(adv[3])
        print(adv[4])
        bluetooth_devices.append(adv[0])

if len(bluetooth_devices) > 0:
        for dev in bluetooth_devices:
            print('\t',ubinascii.hexlify(dev),'    ', dev)

I have all these prints because I thought maybe I can find the MAC or NAME mentioned before.

Thank you for your attention.

[jcaron]

@M-m for privacy reasons, many (most?) BLE devices implement MAC address randomisation in advertisements. You’ll probably have to rely on something different (service, manufacturer data...) to match your phone.

[livius]

@M-m
I do not know how helpfull it will be but:
Are you phones advertising in the moment of scan?
And more wide question are then some new or old one? As BL <> BLE, and some models cannot operate as BLE.
You can also increase timeout from 5 to e.g. 20.
And are you sure that you look at proper MAC address? As phones have e.g. MAC for wifi and MAC for Bluetooth.