hardbyte / hardbyte/python-can

canIoCtlInit failes with canERR_PARAM (-1) on Kvaser Leaf Light v2 for Linux

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bug
Langage dominant
Python
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Description

### Describe the bug
Creating a bus fails during initialization. I'm using the Kvaser backend under Linux with a Kvaser Leaf Light v2. Using the Leaf Light v2 on Windows the same function is successful

```python
import can

bus = can.Bus(
interface="kvaser",
channel=0,
bitrate=500000,
)
```

raises

```
can.interfaces.kvaser.canlib.CANLIBOperationError:
Function canIoCtl failed - Error in parameter [Error Code -1]
```

### To Reproduce
1. Attach a Kvaser Leaf Light dongle (I used the Leaf V2)
2. initialize the bus with `can.interface.Bus(interface='kvaser', channel=0, bitrate=500000)`

### Expected behavior
The bus will initialize without any errors thrown

### Additional context

OS and version: `Fedora 44`
Python version: `3.14.6`
python-can version: `4.6.1`
python-can interface/s (if applicable): Kvaser Leaf Light v2 and Kvaser Linux SDK 5.52

### Investigateion
I verified that...
- `can.detect_available_configs()` correctly discovers the device.
- `canOpenChannel()` succeeds
- the Channel can be opened directly using the CANlib bindings
- the failure occurs during the initialization of `canIoCtlInit()` calls in `KbaserBus.__init__()`

The failure occurs on `canIOCTL_SET_LOCAL_TXACK` or specifically...
```python
canIoCtlInit(
self._read_handle,
canstat.canIOCTL_SET_LOCAL_TXACK,
ctypes.byref(ctypes.c_byte(local_echo)),
1,
)
```

### Work-Around
commenting out this section of code allows me to continue initializing the bus and my program runs smoothly.

### Potentially related Issue
#2051

Guide de contribution

Ouvrir le guide de contribution

Piste de recherche

Start in KvaserBus.__init__ at the canIoCtlInit call for canIOCTL_SET_LOCAL_TXACK, and compare the behavior with related issue #2051 while reproducing with a Kvaser Leaf Light v2 and the provided Bus configuration. Done means the Kvaser bus initializes successfully on Linux without breaking local-TX-ack behavior; verify with a device reproduction.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Évaluation

Stack technique
python
Domaine
backend, embedded-iot
Type d'issue
Bug
Difficulté
3/5
Temps estimé
1-2 jours
Activité
Calme
Clarté
Clairement spécifiée
Accessibilité débutants
68/100

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