-- binary
04 04 # version, type
00 14 # length
12 34 56 78 # xid
00 5c 16 c7 # experimenter
00 00 00 3A # subtype
00 00 00 01 # num_aux
-- python
ofp.message.bsn_set_aux_cxns_request(
    xid=0x12345678, num_aux=1)
-- java
builder.setXid(0x12345678)
       .setNumAux(1)
-- c
obj = of_bsn_set_aux_cxns_request_new(OF_VERSION_1_3);
of_bsn_set_aux_cxns_request_xid_set(obj, 0x12345678);
of_bsn_set_aux_cxns_request_num_aux_set(obj, 1);