struggling to successfully send App Hello #3
Description
Hi! I'm having issues with sending the initial App Hello msg. Below is the script currently writing the App Hello message.
Writing in python (script partially included):
def encrypt_message(data):
padded_len = math.ceil(len(data) / 16) * 16
padded_data = data.ljust(padded_len, b'\x00')
cipher = AES.new(CUBE_KEY, AES.MODE_ECB)
encrypted_message = cipher.encrypt(padded_data)
return encrypted_message
def create_app_hello():
print("creating App Hello msg...")
message = bytearray([
0xfe, 0x15, 0x00, 0x6b, 0x01, 0x00, 0x00, 0x22, 0x06, 0x00, 0x02, 0x08, 0x00
] + list(reversed(bytes.fromhex(CUBE_ADDRESS.replace(':', '')))))
message += crc16_modbus(message)
encrypted_message = encrypt_message(bytes(message))
return encrypted_message[:20], encrypted_message[20:]
...
cube = Peripheral(CUBE_ADDRESS)
cube.setDelegate(CubeDelegate(cube))
service = cube.getServiceByUUID(UUID("fff0"))
char = service.getCharacteristics(UUID("fff6"))[0]
app_hello_chunk1, app_hello_chunk2 = create_app_hello()
char.write(app_hello_chunk1, withResponse=True)
char.write(app_hello_chunk2, withResponse=True)
try:
while True:
if cube.waitForNotifications(1.0):
print("Waiting for notifications...")
except KeyboardInterrupt:
print("Disconnecting from cube")
finally:
cube.disconnect()Terminal output:
attempting to connect to cube...
successfully connected to cube
creating App Hello msg
msg before encryption: b'fe15006b010000220600020800<REVERSE MAC>d94a'
msg before encryption (with padding): b'fe15006b010000220600020800<REVERSE MAC>d94a0000000000000000000000'
encrypted message: b'fe021808925fa310aa1859c6f701b7ed8..c2f72dd2662e7e47447768af'
sending first chunk of App Hello message: b'fe021808925fa310aa1859c6f701b7ed8..'
sending second chunk of App Hello message: b'c2f72dd2662e7e47447768af'
Afterwards, I receive no Cube Hello message in response. I'm curious to know where I am messing up.