can.py 685 Bytes
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from pyb import CAN

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can = CAN(1, CAN.LOOPBACK)
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print(can)
print(can.any(0))
can.send('abcd', 123)
print(can.any(0))
print(can.recv(0))
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can.send('abcd', -1)
print(can.recv(0))

can.send('abcd', 0x7FF + 1)
print(can.recv(0))

#Test too long message
try:
    can.send('abcdefghi', 0x7FF)
except ValueError:
    print('passed')
else:
    print('failed')

del can

#Testing extended IDs
can = CAN(1, CAN.LOOPBACK, extframe = True)
print(can)

try:
    can.send('abcde', 0x7FF + 1)
except ValueError:
        print('failed')
else:
    r = can.recv(0)
    if r[0] == 0x7FF+1 and r[3] == b'abcde':
        print('passed')
    else:
        print('failed, wrong data received')


print('end')