demo_dbc.py

#!/usr/bin/env python3

import sys

import can
import cantools
import os

dbcFilename = "data.dbc"
dbcPath = os.path.join( dbcFilename )

canType = "socketcan"
canChannel = "vcan0"

def main():
    db = cantools.database.load_file( dbcPath )

    # === open can device ===
    try:
        bus = can.interface.Bus( channel=canChannel, bustype=canType )
    except OSError:
        print( f"Failed to open {canChannel}" )
        return 1

    # === main loop ===
    recvCount = 0
    while recvCount < 1000:
        # get can message
        msg = bus.recv( 1 )
        if msg is None:   # nothing recieved
            continue
            
        try:
            data = db.decode_message( msg.arbitration_id, msg.data )
            print( f"{msg.arbitration_id} {data}" )
            recvCount += 1
        except KeyError:
            pass

    bus.shutdown()

if __name__ == '__main__':
    sys.exit( main() )