title: react native WebRTC remote stream not working
body: <p>I'm creating a video chat app
  i just cloned this repo for understanding but its not showing remote stream.
  in the firebase there are 4 ice canditates(2 video 2 audio) from the caller side but only 2 from callee side 2 audio nothing for video.</p>
  <p>No errors in the console.</p>
  <p>the stun servers used are</p>
  <pre><code>`iceServers: [
    {
       urls: ['stun:stun1.l.google.com:19302', 'stun:stun2.l.google.com:19302']
     },
   ],`
  </code></pre>
  <p>I'm completely new to webrtc please help me what can be the problem.
  thank you.</p>