-- binary
04 0a # version, type
00 35 # length
12 34 56 78 # xid
00 00 00 64 # buffer_id
42 68 # total_len
01 # reason
14 # table_id
fe dc ba 98 76 54 32 10 # cookie
00 01 # match.type
00 16 # match.length
80 00 2A 02 # match.oxm_list[0].type_len
00 01 # match.oxm_list[0].value
80 00 01 08 # match.oxm_list[1].type_len
00 00 00 04 # match.oxm_list[1].value
00 00 00 05 # match.oxm_list[1].mask
00 00 # match.pad
00 00 # pad
61 62 63 # data
-- python
ofp.message.packet_in(
    xid=0x12345678,
    buffer_id=100,
    total_len=17000,
    reason=ofp.OFPR_ACTION,
    table_id=20,
    cookie=0xFEDCBA9876543210,
    match=ofp.match(oxm_list=[
        ofp.oxm.arp_op(value=1),
        ofp.oxm.in_port_masked(value=4, value_mask=5)]),
    data="abc")