uctypes

import uctypes

raw = b"\x04\x09\x09\x4d\x69\x63\x72\x6f"

desc = {
    "len": 0 | uctypes.UINT8,
    "type": 1 | uctypes.UINT8,
    "name": (2 | uctypes.ARRAY, 5 | uctypes.UINT8),  # from offset=2 start, 5 UINT8s
}

pkt = uctypes.struct(uctypes.addressof(raw), desc)

print("len :", pkt.len)  # 4
print("type:", pkt.type)  # 9
print("name:", bytes(pkt.name))  # b'Micro'