bridge two python-can interfaces
This is a simple script to bridge two Python-can buses, transferring all data from one bus to the other and vice-versa.
Why would you want to do this? See the Makefile. I have a
cheap CH341-based CAN interface that I wanted to use with a program
written against the Linux
SocketCAN
API. The solution? Set up a SocketCAN vcan virtual CAN interface
and point the program there. Then run this program to bridge the
python-can seeedstudio driver. The virtual CAN interface copies
writes to all readers. (This is how CAN works, after all. Each device
on the bus sees every frame.)
In other words, this allows a Python userspace CAN driver to be used from the SocketCAN interface.
If you have a different interface edit the script (it's very simple).
The Makefile contains all the set up commands so that I don't have to remember them. Default target does everything: it sets up the virtual interface and runs the bridge.
Copy 99-ch340.rules to /etc/udev/rules.d to have the CH340-based
device at the stable name /dev/ttyCH340 rather than some random
index based on when you connected the device. (If you have more than
one CH340 device, you're on your own.)