Getting join request uplink and other config events

Hi! Help please with the next question. I made integrations with app server (PostgreSQL and RabbitMQ) but I can’t get events that have no port such as join request or config packets without port. The event “join” comes only after the first uplink parcel but not after join request. At Vega server such packages write to db and this infocan be used as the time of device last connect (when the parcels are rare this fact can be important), they are with port 0. I didn’t find such info in network and app servers dbs. Is it possible to read such packages without port?