I just submitted a bug report, and its number is FB13969651

Thanks for your reply. Yes, udp worked fine when I rebooted the phone.It should not be the local network permission popup problem mentioned in FAQ-16, because the app has triggered the permission popup during the opening process.If you think this might be a bug, I will submit a bug report. However, my app has been uploaded to the App Store and I keep receiving feedback from users. Is there any way to avoid this problem?