-- binary
04 04 # version, type
00 38 # length
12 34 56 78 # xid
00 5c 16 c7 # experimenter
00 00 00 28 # subtype
fe dc ba 98 76 54 32 10 # cookie
42 68 # priority
14 # table_id
00 # pad
00 00 00 00 # pad
00 01 # match.type
00 16 # match.length
80 00 01 08 # match.oxm_list[0].type_len - IN_PORT
00 00 00 04 # match.oxm_list[0].value
00 00 00 05 # match.oxm_list[0].mask
80 00 2A 02 # match.oxm_list[1].type_len - ARP_OP
00 01 # match.oxm_list[1].value
00 00 # match.pad
-- python
ofp.message.bsn_flow_idle(
    xid=0x12345678,
    cookie=0xFEDCBA9876543210,
    priority=17000,
    table_id=20,
    match=ofp.match([
        ofp.oxm.in_port_masked(value=4, value_mask=5),
        ofp.oxm.arp_op(value=1),
    ]))
-- c
obj = of_bsn_flow_idle_new(OF_VERSION_1_3);
of_bsn_flow_idle_xid_set(obj, 0x12345678);
of_bsn_flow_idle_cookie_set(obj, 0xFEDCBA9876543210);
of_bsn_flow_idle_priority_set(obj, 17000);
of_bsn_flow_idle_table_id_set(obj, 20);
{
    of_match_t match = { OF_VERSION_1_3 };
    match.fields.in_port = 4;
    match.masks.in_port = 5;
    match.fields.arp_op = 1;
    OF_MATCH_MASK_ARP_OP_EXACT_SET(&match);
    of_bsn_flow_idle_match_set(obj, &match);
}
-- java
builder.setXid(0x12345678)
    .setCookie(U64.parseHex("FEDCBA9876543210"))
    .setPriority(17000)
    .setTableId(TableId.of(20))
    .setMatch(
        factory.buildMatch()
            .setMasked(MatchField.IN_PORT, OFPort.of(4), OFPort.of(5))
            .setExact(MatchField.ARP_OP, ArpOpcode.of(1))
                .build()
    );