Accessing Minor & Major from iBeacon scan

[Scott Elliott]

Using ADV_MANUFACTUER_DATA I can cleary see the UUID of the iBeacon I am scanning for. However I cannot view the Major, although I believe I can see the Minor. Obviously to gain the full use of Ibeacon I need to see the minor and major identifiers.

This is the output of the below code -> 4c0002152f234454cf6d4a0fadf2f4911ba9ffa600610003b4

The uuid is 2f234454-cf6d-4a0f-adf2-f4911ba9ffa6 and you can clearly see that in the payload. The Minor is 3 and the major is 977. What am I missing here??

d_in=bluetooth.resolve_adv_data(adv.data, Bluetooth.ADV_MANUFACTURER_DATA)
     if d_in:
           print(ubinascii.hexlify(d_in))

[Scott Elliott]

Just an update, this project got parked for a while, but have tried it this morning and your code did work. Appreciate the assistance!

[Scott Elliott]

@Meriç-SARIIŞIK

Many thanks, implementing that now, will get back to you

[Scott Elliott]

This post is deleted!

[Meriç SARIIŞIK]

Hi Scott,

When you divide the manufacturer_data into fields, you will see the other data. I prepared some lines as follows.

        d_in = bt.resolve_adv_data(adv.data, Bluetooth.ADV_MANUFACTURER_DATA)
        manuf_data = ubinascii.hexlify(d_in[0:4])
        if manuf_data == b'4c000215':
            uuid = ubinascii.hexlify(d_in[4:20])
            major = ubinascii.hexlify(d_in[20:22])
            minor = ubinascii.hexlify(d_in[22:24])
            tx_power = ubinascii.hexlify(d_in[24:25])
            tx_power_real = twoscmp(int(tx_power, 16))
            major_int = int(major, 16)
            minor_int = int(minor,16)
            print(read_adv,manuf,manuf_data, uuid, major, minor, tx_power_real, major_int)

Can you try this code?
Also, you can use this function for 2's complement.

def twoscmp(value):
    if value > 128:
        value = value - 256
    return value

Cheers,
Meric