Custom y-webrtc signaling server connects but no data being sent

Hi there,

We made a custom signaling server that is an exact copy of the example shown here y-webrtc/server.js at master · yjs/y-webrtc · GitHub

We see that the web socket connection is successfully established, but no data seems to be coming through, compared to when using public servers.

Any ideas on what could be wrong? Is there a divergence in the open-source server code and the public signaling server implementations?