imprint.test() never resolves on safari when "localIp" option is included.

[robobakery]

Hello, I would like to report an issue with safari browser.
imprint.test() never resolves on safari when "localIp" option is included.

if I remove "localIp" option from tests array, it worked well.

Insted of listening for candidate events,
I've tried inspecting pc.localDescription after a delay.
somehow it worked (succeeded to get an IP),
but I am not sure what's going on with original code.

so I attached my code below, and I hope it helps.
thank you.

var RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
var re = /c=IN IP4 ([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/;

var localIpTest = new Promise(function(resolve) {
	var pc = new RTCPeerConnection({iceServers:[]});
	var noop = function(){};
	pc.createDataChannel("");
	pc.createOffer(result => pc.setLocalDescription(result, noop, noop), noop);

  setTimeout(() => {
    resolve(re.exec(pc.localDescription.sdp)[1]);
  }, 550);
});

test devices

mobile: webview, in app browser, safari / pc: safari

• physical device (iphone 6s):
• virtual device (iphone 6)
• macbook pro retina 13 (macOS high sierra)

[hawkfx]

I'm having same issue