WebRTC: Support listen at multiple UDP ports.

[winlinvip]

Sometimes UDP8000 is not accessible, so supporting multiple UDP ports would be more appropriate.

IP:

1. Internal IP
2. API's IP
3. Configuring CANDIDATE

Ports:

1. 8000
2. 180000

Protocols:

1. UDP
2. TCP

This way, there will be 6 candidates, and the connectivity will be excellent.

Choose one of the two protocols, UDP or TCP, to avoid priority routing and switching issues; mainly use TCP when UDP is completely unusable.

PS: There is also a TURN/TCP method, which actually uses TURN to convert TCP to UDP, without requiring additional work from the server. However, it requires users to deploy a TURN server separately, making it very inconvenient to use.

[qiantaossx]

Is it possible to support full-ice on the basis of lite-ice? This way, deploying SRS behind NAT can be done without relying on public network candidates. SRS can be used as a P2P client.