Just updated to Xcode 12.5.1 and see the messages when running on an iPhone XR installed with iOS 14.7 but I do not see the messages when running on an iPad Air 2 installed with iPadOS 14.5. An Xcode incompatibility issue (with iOS 14.7)?
Messages seen in the Xcode debug console:
2021-07-21 16:13:59.126185+1200 [539:49192] [connection] nw_endpoint_handler_set_adaptive_read_handler [C52 10.1.1.1:8000 ready channel-flow (satisfied (Path is satisfied), viable, interface: en0, ipv4)] unregister notification for read_timeout failed
2021-07-21 16:13:59.126377+1200 [539:49192] [connection] nw_endpoint_handler_set_adaptive_write_handler [C52 10.1.1.1:8000 ready channel-flow (satisfied (Path is satisfied), viable, interface: en0, ipv4)] unregister notification for write_timeout failed