webrtc-android-codelab | WebRTC for Android Codelab source code | SDK library

I'm trying to create an Android app that uses WebRTC data channels for data exchange. The data that I want to send is basic strings. Admittedly, this is my first time looking at WebRTC, and so I am a bit fuzzy on the details. My problem is that whenever I try to create a data channel, it is always null, and ICE candidate requests do not seem to be exchanged with the signalling server. I started from this example that creates a connection to exchange video between two devices and modified it to not exchange video but instead create a data channel.

I looked through a lot of other answers but the vast majority have to do with WebRTC in the browser, and data channel examples are rare to begin with. I also looked through the google chromium source code implementation of WebRTC in c++ to see if anything could be learned but had no luck.

My code is as follows

WebRtcActivity.kt