STUN and TURN check
Tests connectivity with a STUN or TURN server using WebRTC.
How to use it
var stunturncheck = ;;
The first argument to stunturncheck follows the same convention as the
To test a TURN/TCP server you would pass something along the lines of
url: 'turn:some.host:3478?transport=tcp' username: 'user' credential: 'secret'
as first argument.
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