Collecting packets with wireshark

[Pythontamer9]

trafficstars

Hello, I am studying how messages are transferred between switches and the controller within a NGSDN environment, specifically packet in and packet out messages. I have been using wireshark within the virtual machine to collect these packets, but am not sure I am collecting the right ones. My main question is are packet in and packet out messages transferred on the grpc channel or elsewhere within the network? Thanks in advance!