Flutter_WEBRTC I have this problem when I use different wifi, I can't make calls to each other, but when I connect to the same network

[qminhminh]

I have this problem when I use different wifi, I can't make calls to each other, but when I connect to the same network, I can still make calls to each other. I don't know what's wrong, I hope everyone can help me. This is my source code.
I don't know if the error is due to my code or the configuration of stun/turn. I hope you can see my code and help me fix the error. Thank you very much.

Code Fe:
https://github.com/qminhminh/test_call_video_webrtc
BE:
https://github.com/qminhminh/call_wbrtc_server

@marcoberetta96 @MCYB @niyoceles

Note: errors from onicecandidateerror above are not necessarily fatal. For example an IPv6 DNS lookup may fail but relay candidates can still be gathered via IPv4.
The server stun:stun-connect.fcam.vn:3478 returned an error with code=701:
STUN host lookup received error.
The server turn:stun-connect.fcam.vn:3478?transport=udp returned an error with code=701:
TURN host lookup received error.

Error Log Flutter-Webrtc
https://github.com/qminhminh/webrtc_log_0_calll_video

Log Candidate:
https://github.com/qminhminh/can-iate_webrtc_call_log