
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