The function gen_delta_set() and gen_delta_set_unack(),
so add flag 'UNACK' to distinguish:
DELTA-SET DELTA-SET
->
DELTA-SET DELTA-SET-UNACK
The function gen_delta_set() and gen_delta_set_unack(),
so add flag 'UNACK' to distinguish:
DELTA-SET DELTA-SET
->
DELTA-SET DELTA-SET-UNACK