here in Australia a friend and I both have Rapsberry Pi, RAK831 and resin.io setup using this workshop notes https://www.thethingsnetwork.org/docs/gateways/rak831/ (on AU915)
When we set the router to asia-se on the TTN console, the resin setup changes over just fine.
We can see the gateways online, data is appearing on the TTN gateway console, but no data appears in the application console.
Switch over to us-west and it starts working immediately, change back to asia-se, stops working.
Need any more info to help us out?