window.mySocket.onmessage = function(event){
        var signal = JSON.parse(event.data);
        if (signal.sdp) {
            if(init){
                log('received offer...');
                pc.setRemoteDescription(new RTCSessionDescription(signal))
                    .then(function(){
                        pc.createAnswer()
                        .then(function(answer) {
                            log('created answer...');
                            return pc.setLocalDescription(answer);
                        })
                        .then(function() {
                            log('sent answer');
                            window.mySocket.send(JSON.stringify(pc.localDescription));
                         })
                        .catch(function(reason) {
                            log(reason)
                          });
                    })
                    .catch(function(reason) {
                            log(reason)
                          });
            }else{
                log('received offer...');
                pc.setRemoteDescription(signal)
            }
        }else if(signal.candidate){
            pc.addIceCandidate(new RTCIceCandidate(signal));
        }

    }