Now, We only know connected state in log

We need know more, Is receiver data, The data is be able decode and display

• on RTP send and receiver
• on canplay

on RTP send and receiver

I don't know should use API, maybe should use this https://developer.mozilla.org/en-US/docs/Web/API/RTCInboundRtpStreamStats/bytesReceived

on canplay, use video element event canplay

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video#events