Getting started with OTAA

[joshualee12233]

I am trying to get started with making my first node. I have a gateway based off a RPi 5 with a RAK2287 concentrator running chirpstack.
I am trying to connect a RAK4631 core on a RAK19007 base.

I'm starting off with the quickstart guide from RAK found here. So far I've tried using LoRaWAN_OTAA_ABP.

The weird thing I'm running into is when I change nothing on the sketch except the region -> US915 and upload to the board, the serial monitor looks like it's doing all the right things and has "OTAA Mode, Network joined" folowed by the "lmh_send ok count" counting up periodically. However, when I actually try to change the nodeDeviceEUI and nodeAPPKey to match my board and what I have in chirpstack, it says "OTAA join failed!"

I am also receiving Unconfirmed data ups on my gateway from a seemingly unknown device addr, but it could be coming from my node based on the timing.

Any insight into what I'm missing or doing wrong would be appreciated. This is my first time diving into code and networking on this level. I am mainly a hardware kind of guy.

Thanks!