rtcPeerConnection abnormal behavior?

rtcPeerConnection abnormal behavior?

i start do some test with rtcPeerConnection, i'm a begginer with this
tecnologic and i want to know if it is normal: in the console i print the
ice candidate when method onicecandidate is called, but i don't know if is
normal have many RTCIceCandidate appearing in the console here the output
console
var isChrome = !!navigator.webkitGetUserMedia;
var STUN = {
url: isChrome
? 'stun:stun.l.google.com:19302'
: 'stun:23.21.150.121'
};
var TURN = {
url: 'turn:homeo@turn.bistri.com:80',
credential: 'homeo'
};
var iceServers = {
iceServers: [STUN, TURN]
};
var sdpConstraints = {
optional: [],
mandatory: {
OfferToReceiveAudio: true,
OfferToReceiveVideo: true
}
};
var video = document.getElementById('thevideo');
var button = document.getElementById('thebutton');
navigator.getUserMedia = navigator.getUserMedia ||
navigator.webkitGetUserMedia || navigator.mozGetUserMedia ||
navigator.msGetUserMedia;
RTCPeerConnection = webkitRTCPeerConnection || mozRTCPeerConnection;
var local_stream;
navigator.getUserMedia({video:true, audio:false}, function(stream){
local_stream = stream;
video.src = URL.createObjectURL(stream);
start();
}, function(err){
console.log("The Following error ocurred:"+ err);
});
function start()
{
pc = new RTCPeerConnection(iceServers);
pc.onicecandidate = function(evt)
{
console.log(evt.candidate);
}
pc.createOffer(function(desc)
{
pc.setLocalDescription(desc);
console.log(desc);
},function(err){
console.log("The Following error ocurred:"+ err);
},sdpConstraints);
}