import random import os frame = "AAAAAAAA0200000049000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000F3" frame_data = bytes.fromhex(frame) frames = b'' for i in range(0, 100): frames += frame_data num_bytes = random.randint(1, 10) random_bytes = os.urandom(num_bytes) frames += random_bytes with open("test_data/test_frames_100.bin", "wb") as f: f.write(frames)