iOS how to read bluetoothd service logs in the console?
Apple does a good job in my opinion with bluetooth and debugging.

https://developer.apple.com/bluetooth/

Specifically, you can use the diagnostic profile to get excellent details and a step by step guide to setting things up to make it easier to understand what the codes mean.

https://developer.apple.com/bug-reporting/profiles-and-logs/?name=bluetooth

The bluetooth explorer is also far superior to trying to decode raw hex values in my experience. I try to avoid getting into the raw bytes / physical interface unless there’s no other option.