Question Unity WebRTC with async/await

Hello everyone!

I hope this is the right subforum for this question (the com.unity.webrtc Github repository links here).

In my project I would like to use Unity.WebRTC but with async/await instead of starting Coroutines. There is an asset in the Assetstore offering GetAwaiter extensions for a variety of IEnumerator instances.

Unfortunatelly when I try `var answer = await RTCPeerConnection.CreateAnswer()` this results in a `null` value. Do I need a special Awaiter for the resulting `RTCSessionDescriptionAsyncOperation`? (I see for example that the `AsyncOperationBase` has a `keepWaiting` property, but I am not sure how a GetAwaiter extension should use this.)

Any tipps or hints in the right direction would be greatly appreciated!

Thanks in advance for any insights on this issue and best regards,
Patrick

 

Hello!

Sorry for the delayed reply. I am using this asset for async/await compatibility: https://assetstore.unity.com/packages/tools/integration/async-await-support-101056

Thanks in advance if you can give any tipps for this issue!

Best regards,
Patrick

 

The error is not related to WebRTC. Instead of `var answer = await RTCPeerConnection.CreateAnswer()` you need to save the original returned RTCSessionDescriptionAsyncOperation, to be able to get the return value after awaiting. The helper library you are using does not support return values the way you tried.

Example:

Code (CSharp):

1. var op = pc.CreateAnswer(ref options);
2. await op;
3. if (op.IsError)
4. {
5.     throw new Exception($"Error when creating answer: {op.Error}");
6. }
7. Debug.Log($"Return value is: {op.Desc}");
8.  

 

Hello EirikWahl!

Thank you so much for your answer! I did not realize that this made a difference here. I will definitely try that.

Thanks again and best regards,
Patrick