troubleshooting.md

Troubleshooting

This page aims to present solutions to some common errors.

Missing default configuration file for python-can

Symptoms

Running cc.py and specifying an interface via -i gives the following error: NotImplementedError: Invalid CAN Bus Type - None

Solution

Python-can requires an interface/channel configuration file.

Create a .canrc file in your home directory with the following content:

[default]
interface = socketcan
channel = can0

This step is also described in https://github.com/CaringCaribou/caringcaribou/blob/master/documentation/howtoinstall.md#configure

Documentation for python-can: https://python-can.readthedocs.io/en/master/configuration.html

Inactive CAN interface

Symptoms

Running a module with an interface specified through -i gives the following error: IOError: [Errno 19] No such device. This might be caused by an invalid or inactive CAN interface.

Solution

Activate your CAN interface - this needs to be done after each reboot of your system.

For physical interfaces (note: bitrates may vary depending on the CAN bus you are connected to):

echo "Setting up CAN interface can0"
sudo modprobe can
sudo ip link set can0 up type can bitrate 500000

For virtual interfaces:

echo "Setting up virtual CAN interface vcan0"
sudo modprobe vcan
sudo ip link add dev vcan0 type vcan
sudo ip link set vcan0 up

Missing python-can

Symptoms

Running cc.py gives the following error message:

Traceback (most recent call last):
  File "cc.py", line 5, in <module>
    import can
ImportError: No module named can

Solution

Install python-can. This can be done by running pip install python-can