ICE failed, PeerJS call started but no video/audio through - webrtc

Question

I am trying to get a simple video chat working with PeerJS. I want to send audio between Firefox on a pc and Firefox on Android. I can get the call running (call.on) and I can view local video but for some reason the media just doesn't come through to the other user. Currently I am getting the error:
ICE failed, see about:webrtc for more details
I have a server which in its simple version is as such:
var ip = require('ip');
var PeerServer = require('peer').PeerServer;
var port = 9000;
var server = new PeerServer({port: port, allow_discovery: true});
Then I have two clients, one for the pc that makes the call:
var SERVER_IP = window.location.hostname;
var SERVER_PORT = 9000;
var localStream = "";
var peerID = "pc"
var peerConnectionID = "and"
var remoteVideo = document.querySelector('#rremote-video');
var localVideo = document.querySelector('#llocal-video');
var peer = new Peer(peerID, {host: SERVER_IP, port: SERVER_PORT});
var conn = peer.connect(peerConnectionID);
var getUserMedia = navigator.mediaDevices.getUserMedia({ video: true, audio: true })
.then(stream => localVideo.srcObject = stream)
.then(stream => localStream = stream)
.catch(e => console.log(e.name + ": "+ e.message));
waitForElement();
function waitForElement(){
if(localStream != ""){
conn.on('open', function(){
conn.send('hi from PC!');
});
peer.on('connection', function(conn) {
conn.on('data', function(data){
console.log(data);
});
});
console.log("we have a stream: "+localStream);
var call = peer.call(peerConnectionID, localStream);
console.log("Calling "+peerConnectionID);
call.on('stream', function(remotestream) {
console.log("Call on.");
remoteVideo.srcObject = remotestream;
});
}
else{
setTimeout(function(){
waitForElement();
},750);
}
}
And the one that answers the call is:
var SERVER_IP = window.location.hostname;
var SERVER_PORT = 9000;
var localStream = "";
var peerID = "and"
var peerConnectionID = "pc"
var remoteVideo = document.querySelector('#rremote-video');
var localVideo = document.querySelector('#llocal-video');
var remoteAudio = document.querySelector('#remote-audio');
var localAudio = document.querySelector('#local-audio');
var peer = new Peer(peerID, {host: SERVER_IP, port: SERVER_PORT});
var conn = peer.connect(peerConnectionID);
var getUserMedia = navigator.mediaDevices.getUserMedia({ video: true, audio: true })
.then(stream => localAudio.srcObject = stream)
.then(stream => localVideo.srcObject = stream)
.then(stream => localStream = stream)
.catch(e => console.log(e.name + ": "+ e.message));
waitForElement();
function waitForElement(){
if(localStream != ""){
conn.on('open', function(){
conn.send('hi from android!');
});
peer.on('connection', function(conn) {
conn.on('data', function(data){
console.log(data);
});
});
peer.on('call', function(call) {
console.log("Picking up call.");
call.answer(localStream);
call.on('stream', function(remotestream) {
console.log("Call on.");
remoteVideo.srcObject = remotestream;
});
});
}
else{
setTimeout(function(){
waitForElement();
},750);
}
}
I think it is some little tweak that I'm getting wrong, I have mainly followed instructions on PeerJS website: http://peerjs.com/ Please if anyone can see something that needs to change, any help is welcome!

Answer 1

Are you using https? Making calls to non-local machines is no longer allowed by the browsers.
To test this out, run both sets of code on your local machine. If you can do that connection, it means your code is ok.
To do a remote connection you will unfortunately need https. This means you will also need your own peerjs server (to run as https).
The other option is to use port forwarding to make one of the machines think it is talking to the localhost

Answer 2

It sounds like your ICE Candidates cannot communicate one to each other. You will have to use a STUN server and, if it still doesnt work, you will need a TURN server.
From PeerJS Documentation:
var peer = new Peer({
config: {'iceServers': [
{ url: 'stun:stun.l.google.com:19302' },
{ url: 'turn:homeo#turn.bistri.com:80', credential: 'homeo' }
]} /* Sample servers, please use appropriate ones */
});
This link will provide you a method to deploy your own TURN server.