PF Logging only no actions

Hello folks,
is there an option, to only log all stuff going on via "log" command and without taking any action to traffic flow itself ?

I'm migrating an existing iptables firewall, and i want to set the new one in front of it and bridge the traffic to the old one. Meanwhile I want to test my iptables -> pf ruleset and snooping the bridge traffic with pflog and tcpdump, but the "new" firewall needs to let the traffic flow without take any actions except logging.

Thank you very much ;)
You can pass log and block log. Whatever suits your needs. But if you want to log all traffic tcpdump(1) is the more obvious choice.