Convert Bluetooth notification message from byte string to byte array? First byte missing?

[kami83]

Hi,

i am recieving from a rowing machine BT Messages. If i capture them with a PC and bleak i get this Messages:

00002ad1-0000-1000-8000-00805f9b34fb (Handle: 65): Rower Data: [44, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 255, 0, 5, 0]

If i capture the same messages as notification with cb i get this:

b',\x0b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\x00\x05\x00'

There is in the beginning the 44 (Hex:2C) missing.
How can i convert the byte string to a normal byte array. And why is the first byte missing?

Thx a lot.

BR kami

[cclauss]

>>> from array import array
>>> array('b', b',\x0b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\x00\x05\x00')
array('b', [44, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, 0, 5, 0])

The Rower Data is unsigned (255) while the array is signed (-1).