-- binary
04 04 # version, type
00 18 # length
12 34 56 78 # xid
00 5c 16 c7 # experimenter
00 00 00 32 # subtype
00 14 # table_id
00 00 # pad
00 11 22 33 # buckets_size
-- python
ofp.message.bsn_gentable_set_buckets_size(
    xid=0x12345678,
    table_id=20,
    buckets_size=0x00112233)