I've created 2 simple webpages (for peer 1 and peer 2) that exchange a few messages with WebRTC data channel. You need to manually copy-paste offer and answer between the webpages. After the answer is pasted back to peer 1 the connection is established and those messages are sent and received. But, it only works if both peers are behind normal NAT.
Therefore I tried to use TURN server. I tried self-hosted Coturn server and Xirsys turn service, but just couldn't get them to work.
The web pages on codesandbox are:
- Peer 1: https://codesandbox.io/s/web-rtc-peer-1-shared-zl09e
- Peer 2: https://codesandbox.io/s/web-rtc-peer-2-shared-9z40r
The sandboxes now have fake credentials for turn servers, but I used real ones (static) in my experiments.
So, if I use this sandboxes in symetric NAT, or I just force the use of turn server with config iceTransportPolicy: "relay", then it does not work - the connection does not open.
Question 1: What do I have to do to make it work?
Question 2: Can you make it work with your own TURN server (and iceTransportPolicy: "relay" config option?