Install the coturn (Optional)

If the cellular network is used, the coturn is required because the 5G NAT setting by ISP may block p2p. Or try some cloud service that provides TURN server.

1. Install

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   sudo apt update
   sudo apt install coturn
   sudo systemctl stop coturn.service

2. Edit config sudo nano /etc/turnserver.conf, uncomment or modify below options

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   listening-port=3478
   listening-ip=192.168.x.x
   relay-ip=192.168.x.x
   external-ip=174.127.x.x/192.168.x.x
   #verbose
   lt-cred-mech
   user=webrtc:webrtc
   realm=greenhouse
   no-tls
   no-dtls
   syslog
   no-cli

3. Set the port 3478 forwarding on the router/modem.
4. Start the service, sudo systemctl start coturn.service