Handle ICE end of candidate

Firefox v68 shipped an update which sends an ICE end of candidates message (bugzilla thread). The offer looks like this:

{candidate: {candidate: "", sdpMLineIndex: 0, sdpMid: "0"}}

This seems to introduce an incompatibility between the latest version of Firefox (68.0) and Chrome (75.0.3770.100). When the offer is received in Chrome, an OperationError is thrown.

In my own testing, this is what I’m seeing:

I’m using simple-peer@9.3.0 which isn’t the latest so I’ll upgrade and update this thread if it fixes the problem. Error persists on simple-peer@9.4.0.

[samuelmaddock]

@t-mullen Correct. I suspect this is ultimately up to Chrome to support, but it might be nice for simple-peer to smooth over the differences in the meantime.

[corwin-of-amber]

So the new “end” candidate has event.candidate.candidate: '' instead of event.candidate.candidate:null and Chrome doesn’t support this?

In my Firefox (running on Mac) I observed candidate: "" as well as a null candidate to signify the end of the candidates list.