-- binary
04 08 # version, type
00 0c # length
12 34 56 78 # xid
00 02 # flags
ff ff # miss_send_len
-- python
ofp.message.get_config_reply(
    xid=0x12345678,
    flags=ofp.OFPC_FRAG_REASM,
    miss_send_len=0xffff)
-- java
builder.setXid(0x12345678)
    .setFlags(Sets.immutableEnumSet(OFConfigFlags.FRAG_REASM))
    .setMissSendLen(0xffff)
    .build()