Decode different protobuf messages on same UDP socket pair based on source address

edit

I have an application where two devices with fixed IPv4 addresses use the same UDP port on each end to send commands from A to B, and responses from B to A. Command and response are different message types.

I would like to configure Wireshark to decode packets on that UDP port as commands when sent from A, and as responses when sent from B.

At present, I have to go into preferences and switch the order of entries in the Protobuf section to change the decoding. I can see the correct decoding for commands or for responses, but never both at once.