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#!/usr/bin/env python3
"""
This shows how message filtering works.
"""
import time
import can
def main():
"""Send some messages to itself and apply filtering."""
with can.Bus(interface="virtual", receive_own_messages=True) as bus:
can_filters = [{"can_id": 1, "can_mask": 0xF, "extended": True}]
bus.set_filters(can_filters)
# print all incoming messages, which includes the ones sent,
# since we set receive_own_messages to True
# assign to some variable so it does not garbage collected
with can.Notifier(bus, [can.Printer()]): # pylint: disable=unused-variable
bus.send(can.Message(arbitration_id=1, is_extended_id=True))
bus.send(can.Message(arbitration_id=2, is_extended_id=True))
bus.send(can.Message(arbitration_id=1, is_extended_id=False))
time.sleep(1.0)
if __name__ == "__main__":
main()
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