-- binary
04 13 # version, type
00 80 # length
12 34 56 78 # xid
00 06 # stats_type
00 00 # flags
00 00 00 00 # pad
00 48 # entries[0].length
00 00 # pad
00 00 00 01 # entries[0].group_id
00 00 00 08 # entries[0].ref_count
00 00 00 00 # pad
00 00 00 00 00 00 00 10 # entries[0].packet_count
00 00 00 00 00 00 00 20 # entries[0].byte_count
00 00 00 14 # entries[0].duration_sec
00 00 00 64 # entries[0].duration_nsec
00 00 00 00 00 00 00 01 # entries[0].bucket_stats[0].packet_count
00 00 00 00 00 00 00 02 # entries[0].bucket_stats[0].byte_count
00 00 00 00 00 00 00 03 # entries[0].bucket_stats[1].packet_count
00 00 00 00 00 00 00 04 # entries[0].bucket_stats[1].byte_count
00 28 # entries[0].length
00 00 # pad
00 00 00 01 # entries[0].group_id
00 00 00 08 # entries[0].ref_count
00 00 00 00 # pad
00 00 00 00 00 00 00 10 # entries[0].packet_count
00 00 00 00 00 00 00 20 # entries[0].byte_count
00 00 00 14 # entries[0].duration_sec
00 00 00 64 # entries[0].duration_nsec
-- python
ofp.message.group_stats_reply(
    xid=0x12345678,
    flags=0,
    entries=[
        ofp.group_stats_entry(
            group_id=1,
            ref_count=8,
            packet_count=16,
            byte_count=32,
            duration_sec=20,
            duration_nsec=100,
            bucket_stats=[
                ofp.bucket_counter(packet_count=1, byte_count=2),
                ofp.bucket_counter(packet_count=3, byte_count=4)]),
        ofp.group_stats_entry(
            group_id=1,
            ref_count=8,
            packet_count=16,
            byte_count=32,
            duration_sec=20,
            duration_nsec=100,
            bucket_stats=[])])