WebRTC screen share not working on LTE in USA

Question

I am developing one Android application for remote screen share using webRTC. For STUN servers I used google stun server. It is working well on WIFI and LTE in India. In USA it's not working on LTE, but it's working on WIFI.

First, I used only STUN server and then now combined STUN and TURN servers, but no use .

Below is my code,

val iceServers = ArrayList<PeerConnection.IceServer>()
iceServers.add(PeerConnection.IceServer("stun:stun.l.google.com:19302"))
iceServers.add(PeerConnection.IceServer("turn:13.250.13.83:3478?transport=udp", "YzYNCouZM1mhqhmseWk6", "YzYNCouZM1mhqhmseWk6"))
return iceServers

Still, this is not working in USA on LTE.

Is this GOOGLE stun server doesn't work for USA in LTE?

Answer 1

Check network connections with STUN, TURN

Check these two links in latest Chrome in mobile.

https://networktest.twilio.com

https://test.webrtc.org

Probably you can check the network is okay or not.

Maybe IPv6 Problem

Also in Korea, I have some problem with IPv6 LTE mobile clients. Sometimes mobile carrier give IPv6 to their clients, then P2P connection does not work. Maybe there is same problem on there.

I solved with TURN + TCP. I don't know why, but IPv6 clients are not works with UDP.

Here are some related documents:

• Webrtc media over tcp?

  To force strict TCP via TURN server:

  • Use only TURN url with ?transport=tcp
  • Specify iceTransportPolicy:"relay", so that all media will flow via TURN

• TURN, STUN setting

  Provide TURN and STUN functionality over TCP and UDP:

  sudo turnserver -L <your STUN server\'s IP address> -o -a -f -r red5pro.com
  

  To run the server without TCP:

  sudo turnserver -L <your STUN server\'s IP address> -o -a -f --no-tcp --no-tcp-relay -r red5pro.com
  

  To run STUN only over UDP:

  sudo turnserver -L <your STUN server\'s IP address> -o -a -f --stun-only --no-tcp --no-tcp-relay -r red5pro.com
  

• What happens when WebRTC shifts to TURN over TCP