adv_data = bytearrayx02x01x02 + bytearraylenname + 1 0x09 + name

The code snippet is creating a byte array called "adv_data".

The byte array is constructed by concatenating three parts:

1. The first part is a byte array with three elements: '\x02', '\x01', and '\x02'.
2. The second part is a byte array with the length of the variable "name" plus one, and the value 0x09. The length is obtained by using the len() function on the "name" variable.
3. The third part is the byte representation of the "name" variable.

Overall, the "adv_data" byte array is constructed by combining these three parts