Unable to correlate devices between gateway api and appserver in integration

[diamondo25]

The only point where the Application server reports the DevAddr is in the JoinEvent, and afterwards its completely unreported. This is a shame, because its very valueable information. The Gateway API basically only communicates the DevAddr and no DevEUI.

https://github.com/brocaar/chirpstack-api/blob/4b2fcccf1796cd4e0edc08682435a1593573604f/protobuf/as/integration/integration.proto#L103-L104

https://github.com/brocaar/chirpstack-api/blob/master/protobuf/nc/nc.proto

I would like to see either the DevAddr on the Gateway part, or the DevEUI on the appserver Integration API. The added benefit of having the DevAddr on the gateway, is that if a join request is accepted, the address is already known. Now I have to wait for the first data to arrive at the station in order to pick it up from the Join event of the appserver.