-- binary
06 12 # version, type
00 18 # length
12 34 56 78 # xid
00 06 # multipart message type (OFPMP_GROUP_STATS)
00 01 # flags
00 00 00 00 # pad
00 00 00 01 # group_id
00 00 00 00 # pad
-- java
builder
        .setXid(0x12345678)
        .setFlags(ImmutableSet.<OFStatsRequestFlags>of(OFStatsRequestFlags.REQ_MORE))
        .setGroup(OFGroup.of(1))
        .build()