fc.add_mapping('speaker', bt2.SignedIntegerRangeSet([(12, 16)]))
fc.add_mapping('can', bt2.SignedIntegerRangeSet([(18, 2540)]))
fc.add_mapping(
fc.add_mapping('speaker', bt2.SignedIntegerRangeSet([(12, 16)]))
fc.add_mapping('can', bt2.SignedIntegerRangeSet([(18, 2540)]))
fc.add_mapping(