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RobotWebTools / webrtc_ros

Streaming of ROS Image Topics using WebRTC
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Has anyone been able to get this to work over the internet? #39

Open pbafff opened 5 years ago

pbafff commented 5 years ago

The streamer only seems to work if both peers are on the same machine or the same local network. The only way I've gotten it to work over the internet is by connecting my desktop to my cloud vm with openvpn. I thought the problem was that stun servers aren't being used so I added stun:stun.l.google.com:19302 to the peer connection config in both webrtc_client.cpp and webrtc_ros.js but no luck. chrome://webrtc-internals/ shows that iconnectionstatechange is failed but I don't know enough about webrtc to interpret that.

roehling commented 5 years ago

The problem lies in the NAT traversal, which is almost always required for machines connecting over the Internet. There is a long-standing wishlist bug (#24) for that, but I haven't looked into it yet.

As always, if someone wants to work on it and submit a PR, I'd be more than happy to add such a feature.

pbafff commented 5 years ago

Do you have any guesses as to what exactly is wrong? I'm going to try to solve this and submit a PR if i get it.

pbafff commented 5 years ago

Ok so it looks like the streamer only generates host ice candidates. Wireshark shows that it never gets any responses from the stun or turn servers.