HPE VAN SDN Controller packet-in event

[Ahmed7]

i have build an sdn app that in one of it's classes has a nested class that implements the SequencedPacketListener

as it's in the docs (Hpe van programming guide 2.7)

when a packet in occors (and i have verified that using wireshark) the event method didn't invoced.

i also tried extending the SequencedPacketAdapter class. 

does the PacketSequencer interface has a roll in this opration ?

or if not, what is the problem ?

note : i tried the observer role and included the correcet protocol id, im using mininet for network .