DataChannel not working as expected (Realtime API with WebRTC)

API
1

Hi!
I’m developing a website that connects to OpenAI’s real-time speech-to-speech model to build a speech AI assistant. I’ve successfully implemented the audio streaming part, but I’m having trouble receiving messages on the data channel from OpenAI. This is critical because I need those messages to trigger other functions. The data channel was working fine last week, but now, after resuming development, it’s no longer receiving messages.

For reference, I’ve created a valid data channel and confirmed it opens correctly with:

dataChannel.onopen = () => {
  console.log('Data channel opened');
};

However, the dataChannel.onmessage event handler is not being triggered. My code looks like this:

dataChannel.onmessage = async (event) => {
  try {
    const realtimeEvent = JSON.parse(event.data);
    console.log('Received realtime event:', realtimeEvent);
  } catch (error) {
    console.error('Error parsing realtime event:', error);
  }
};

Has there been any recent change to the API or service? Is anyone else experiencing this issue?