Error message: The length of the provided data is not a multiple of the block length

[lennon101]

-->

The problem

Reopening issue number #78 which was closed in 2020. I have on the latest version (v5.2.1) and experiencing the exact same probelm. My home-assistant log has a repeating error (seems to be stuck in a loop) with the following contents:

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.10/asyncio/events.py", line 80, in _run
    self._context.run(self._callback, *self._args)
  File "/usr/lib/python3.10/asyncio/selector_events.py", line 1035, in _read_ready
    self._protocol.datagram_received(data, addr)
  File "/config/custom_components/localtuya/discovery.py", line 67, in datagram_received
    data = data.decode()
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xf0 in position 0: invalid continuation byte
2023-07-07 14:10:02.176 ERROR (MainThread) [homeassistant] Error doing job: Exception in callback _SelectorDatagramTransport._read_ready()
Traceback (most recent call last):
  File "/config/custom_components/localtuya/discovery.py", line 65, in datagram_received
    data = decrypt_udp(data)
  File "/config/custom_components/localtuya/discovery.py", line 30, in decrypt_udp
    return _unpad(decryptor.update(message) + decryptor.finalize()).decode()
  File "/usr/lib/python3.10/site-packages/cryptography/hazmat/primitives/ciphers/base.py", line 185, in finalize
    data = self._ctx.finalize()
  File "/usr/lib/python3.10/site-packages/cryptography/hazmat/backends/openssl/ciphers.py", line 222, in finalize
    raise ValueError(
ValueError: The length of the provided data is not a multiple of the block length.

During handling of the above exception, another exception occurred:

Environment

• Localtuya version: v5.2.1
• Home Assistant Core version: Home Assistant 2023.7.1
• Does the device work using the Home Assistant Tuya Cloud component ?
• Was the device working with earlier versions of localtuya ?

[lennon101]

Just updating the errror message to include everything in its entirety. It's very possible this is linked to only some devices. The issue is, I can't seem to be able to see in the log which device is sending the data that can't be decoded. Any help with this?

2023-07-09 13:07:10.955 ERROR (MainThread) [homeassistant] Error doing job: Exception in callback _SelectorDatagramTransport._read_ready()
Traceback (most recent call last):
  File "/config/custom_components/localtuya/discovery.py", line 65, in datagram_received
    data = decrypt_udp(data)
           ^^^^^^^^^^^^^^^^^
  File "/config/custom_components/localtuya/discovery.py", line 30, in decrypt_udp
    return _unpad(decryptor.update(message) + decryptor.finalize()).decode()
                                              ^^^^^^^^^^^^^^^^^^^^
  File "/lsiopy/lib/python3.11/site-packages/cryptography/hazmat/primitives/ciphers/base.py", line 186, in finalize
    data = self._ctx.finalize()
           ^^^^^^^^^^^^^^^^^^^^
  File "/lsiopy/lib/python3.11/site-packages/cryptography/hazmat/backends/openssl/ciphers.py", line 222, in finalize
    raise ValueError(
ValueError: The length of the provided data is not a multiple of the block length.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.11/asyncio/events.py", line 80, in _run
    self._context.run(self._callback, *self._args)
  File "/usr/lib/python3.11/asyncio/selector_events.py", line 1169, in _read_ready
    self._protocol.datagram_received(data, addr)
  File "/config/custom_components/localtuya/discovery.py", line 67, in datagram_received
    data = data.decode()
           ^^^^^^^^^^^^^
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb2 in position 2: invalid start byte

[r-estermann]

I think i have the same issue.
I have an tuya LED Wifi controller i want to connect with localtuya and got "no devices detected"
In debug log I have same errors like above:

`2023-07-13 17:21:26.574 ERROR (MainThread) [homeassistant] Error doing job: Exception in callback _SelectorDatagramTransport._read_ready()
Traceback (most recent call last):
File "/config/custom_components/localtuya/discovery.py", line 65, in datagram_received
data = decrypt_udp(data)
^^^^^^^^^^^^^^^^^
File "/config/custom_components/localtuya/discovery.py", line 30, in decrypt_udp
return _unpad(decryptor.update(message) + decryptor.finalize()).decode()
^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/cryptography/hazmat/primitives/ciphers/base.py", line 186, in finalize
data = self._ctx.finalize()
^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/cryptography/hazmat/backends/openssl/ciphers.py", line 222, in finalize
raise ValueError(
ValueError: The length of the provided data is not a multiple of the block length.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.11/asyncio/events.py", line 80, in _run
self._context.run(self._callback, *self._args)
File "/usr/local/lib/python3.11/asyncio/selector_events.py", line 1169, in _read_ready
self._protocol.datagram_received(data, addr)
File "/config/custom_components/localtuya/discovery.py", line 67, in datagram_received
data = data.decode()
^^^^^^^^^^^^^
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xf1 in position 0: invalid continuation byte`

any ideas?
thx

[paris-ci]

I have the same issue, but with a slightly different callback

homeassistant  | 2023-09-24T20:15:10.224641226Z 2023-09-24 22:15:10.223 ERROR (MainThread) [homeassistant] Error doing job: Exception in callback _SelectorDatagramTransport._read_ready()
homeassistant  | 2023-09-24T20:15:10.224684415Z Traceback (most recent call last):
homeassistant  | 2023-09-24T20:15:10.224701616Z   File "/config/custom_components/localtuya/discovery.py", line 65, in datagram_received
homeassistant  | 2023-09-24T20:15:10.224711216Z     data = decrypt_udp(data)
homeassistant  | 2023-09-24T20:15:10.224719499Z            ^^^^^^^^^^^^^^^^^
homeassistant  | 2023-09-24T20:15:10.224727561Z   File "/config/custom_components/localtuya/discovery.py", line 30, in decrypt_udp
homeassistant  | 2023-09-24T20:15:10.224757487Z     return _unpad(decryptor.update(message) + decryptor.finalize()).decode()
homeassistant  | 2023-09-24T20:15:10.224766868Z                                               ^^^^^^^^^^^^^^^^^^^^
homeassistant  | 2023-09-24T20:15:10.224774219Z   File "/usr/local/lib/python3.11/site-packages/cryptography/hazmat/primitives/ciphers/base.py", line 186, in finalize
homeassistant  | 2023-09-24T20:15:10.224781901Z     data = self._ctx.finalize()
homeassistant  | 2023-09-24T20:15:10.224790268Z            ^^^^^^^^^^^^^^^^^^^^
homeassistant  | 2023-09-24T20:15:10.224798384Z   File "/usr/local/lib/python3.11/site-packages/cryptography/hazmat/backends/openssl/ciphers.py", line 222, in finalize
homeassistant  | 2023-09-24T20:15:10.224807164Z     raise ValueError(
homeassistant  | 2023-09-24T20:15:10.224814635Z ValueError: The length of the provided data is not a multiple of the block length.
homeassistant  | 2023-09-24T20:15:10.224822231Z
homeassistant  | 2023-09-24T20:15:10.224829401Z During handling of the above exception, another exception occurred:
homeassistant  | 2023-09-24T20:15:10.224837978Z
homeassistant  | 2023-09-24T20:15:10.224846053Z Traceback (most recent call last):
homeassistant  | 2023-09-24T20:15:10.224853971Z   File "/usr/local/lib/python3.11/asyncio/events.py", line 80, in _run
homeassistant  | 2023-09-24T20:15:10.224862520Z     self._context.run(self._callback, *self._args)
homeassistant  | 2023-09-24T20:15:10.224870306Z   File "/usr/local/lib/python3.11/asyncio/selector_events.py", line 1163, in _read_ready
homeassistant  | 2023-09-24T20:15:10.224878876Z     self._protocol.datagram_received(data, addr)
homeassistant  | 2023-09-24T20:15:10.224885376Z   File "/config/custom_components/localtuya/discovery.py", line 67, in datagram_received
homeassistant  | 2023-09-24T20:15:10.224890793Z     data = data.decode()
homeassistant  | 2023-09-24T20:15:10.224895824Z            ^^^^^^^^^^^^^
homeassistant  | 2023-09-24T20:15:10.224902953Z UnicodeDecodeError: 'utf-8' codec can't decode bytes in position 0-1: invalid continuation byte

[paris-ci]

So I investigated a bit, other smartlife things seems to be detected correctly, but these switches are the one causing the problem :

https://www.amazon.fr/Programmable-Compatible-Consommation-ventilateur-climatiseur/dp/B0C5MX9F38/

"EIGHTREE Prise Connectée WiFi 5GHz, Prise Alexa Programmable, Compatible avec Alexa/Google Home/Smart Life APP, Suivi de Consommation, Contrôler le ventilateur/climatiseur, 16A 3680W, Type F, 4PCS"

[sharkwsk]

Anyone able to fix this issue, I get the same error messages and some devices are not discovered in localtuya

[paris-ci]

Use this instead https://github.com/xZetsubou/hass-localtuya

[sharkwsk]

Thanks heaps @paris-ci - this new integration works perfectly

[sowmyagowri]

Thanks a ton @paris-ci !!!!

[paris-ci]

:D