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Create ML : error handling "Data Source Missing"

I have just started using Create ML and discovered it to be unstable and obviously not fully tested. I created object training data using IBM Cloud Annotation which imported fine and create a model. I then gave Create ML testing data. However then, in error, I renamed the directory containing the test data. Create ML then entered into, what appears to-be, a loop continuously flashing up a dialogue saying Test Data "Data Source Missing" and there appears to be no way to exist this state other than by closing Create ML. No whenever I open Create ML and navigate to Evaluation > Testing the "Data Source Missing" dialogue starts flashing. So I now have a Create ML project that appears useless. For this project there is no way to choose test data! Any ideas? I should probably raise a bug report.
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by venerley.
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[tcp] nw_proto_tcp_route_init [C1.1:1] no mtu received

I have simple iOS App running on an iPad using Network.Framework, NWConnection and NWEndpoint to setup a TCP connection to a Microchip RN-171. It all worked fine until iOS 14 when I started to occasionally get this error: [tcp] nw_proto_tcp_route_init [C1.1:1] no mtu received at which point the connection just locks up with no further data flow in either direction is possible with respect to iOS. Looking at the RN-171 data sheet I see that the default value for mtu is 1524 so I am assuming that during the negotiation between the RN-171 and iOS this value should be set and some change in iOS 14 means that this value doesn't always get to iOS. Any ideas what the root cause might be and how to fix it?
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by venerley.
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MetricKit: responsibility for processing Payloads?

Having read several posts on MetricKit and I'm very confused! I understand that: didReceive(_ payloads: [MXMetricPayload]) gets called with payloads containing performance data. However as a developer do I need todo anything with this data or can I just leave it up-to Apple for processing? How does this data find its way to Apples servers for download to Xcode organiser? There is obviously a big bit of the story that I am missing!
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by venerley.
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macOS serial port programming in swift

Appologies if not using the correct forum for this question? however it is closest I could find.have been disappointed with the lack of Apple documention supporting serial port programming. The best I've found is thiswebsite. Are there recommend swift libraries/frameworks for interacting with serial devices via USB? perhaps with some examples.Hopefully
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by venerley.
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WiFi Architecture Documentation

can someone please post the link to the Architecture Documentation that explains the big picture of Apple networking relating to WiFi.I am trying to understand where NEHotspotConfiguration and NEHotspotConfigurationManager fit in the "grand scheme of things"Apple have provide high-level documentation in the past on technologies such a Bluetooth. However recently it appears to have gone out of fashion and we just get class descriptions. Bottom up learning is inefficient.Thanks in advance.
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by venerley.
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Network.Framework background operation

I have a simple app that sends and receives data over WiFi using Network.Framework. It receives about 80 bytes every 10 seconds.The issue comes when the user wants to leave the app runing and do something else, perhaps check their mail. As soon as the user selects the home button the app is put into the background and Network.Framework disconnects.How to I prevent the initial disconnection on entry in to background? andHow do I enable support for the 80 bytes every 10 secondsthat are written to a file?All wisdon gratefully accepted.
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by venerley.
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