Smbus2 no longer working after upgrading to Core 2021.2.3

Hardware
1

All,

I have a Home Assistant implementation which heavily depends on I2C control of an MCP23017. I directly control the I2C parameters with smbus2.

After upgrading to Core 2021.2.3 today, the automation stopped working, seriously impacting the whole implementation.

I could nail down the issue to smbus2. Just adding the line

from smbus2 import SMBusWrapper

will fail the implementation already. I need to add that I also have the following requirements in my code.

REQUIREMENTS = ['smbus2==0.2.1']

Has something changed in the smbus2 implementation or the version with the new Core OS?

Thanks all.
Kind regards.

2

OK, found it.

If there are other people running into the same issue: the new version is 0.3.1.

REQUIREMENTS = ['smbus2==0.3.1']

… and then smbus2 can be called with e.g.

from smbus2 import SMBus
with SMBus(1) as smbus:
   ...

Available in case you need more information or help.

Kind regards.

3

Hello, I have similar problem with SMBUS doesn’t work after HA upgrade to newer version. Could You explain more about solution, where i should change this place REQUIREMENTS = [‘smbus2==0.3.1’]?
I use this expand board and solution for HA abelectronics-home-assistant-custom-components/abelectronicsiopi at master · abelectronicsuk/abelectronics-home-assistant-custom-components · GitHub

Thanks

4

Hi Andrius,

Looking back at my post, I must admit that I was pretty sparse in the information I gave. In the meantime I also solved the problem in a totally different way, so I am no longer dependent on the smbus2 version, but here goes …

Back then I had programmed my own switch. The folder with the switch then has the following minimal components.

image

The REQUIREMENTS = [‘smbus2==0.3.1’] line is located in the switch.py file.

I didn’t find back the requirements in the abelectronicsuk library you mentioned. If you want to add it nevertheless, I would try adding the line in the IOPi.py file.

image

… and I would change the

try:
    from smbus2 import SMBus
except ImportError:

    try:
        from smbus import SMBus
    except ImportError:
        raise ImportError("python-smbus or smbus2 not found")

lines into:

REQUIREMENTS = ['smbus2==0.3.1']

try:
    from smbus2 import SMBus
except ImportError:
    raise ImportError("python-smbus2 not found")