The v3 documentation says,
Whether remote IP:port should be auto-detected based on first RTP/RTCP packet received. If enabled, connect() must only be called if SRTP is enabled by providing the remote srtpParameters and nothing else.
Consider 1:n video streaming, when there is 1 producer but many consumers, if server side’s RTP port in udp can be set to
listen mode like in tcp, then sdk-based client(not webrtc client) can directly pull H264 stream from this RTP port, without need to ask for a dynamic port or calling
plainTransport.connect at server side.