iPhone 13 mini running iOS 26.2
I went to mirror a stream to a previously used Roku device. The Roku popped right up on the Screen Mirror list, but would not respond. Investigation showed it had lost its network connection - so what showed on the Screen Mirror list was still in cache, not from a current request - and sure enough, after repairing the Roku's LAN connection, it worked fine. That raised these questions:
Does the iOS device (iPhone) cache a Screen Mirror list for each network?
How does the iOS device build its list of Screen Mirror servers on a local network? I presume it broadcasts a request to the LAN, the first time it is invoked on a new LAN, asking "Does anyone provide this service?" - Is that correct? [Is that broadcast a Bonjour function?] If not, how does it acquire its list of Screen Mirror servers?
To avoid the problem of false positives in the Screen Mirror list, how can I clear that cache (#1) and issue a new request (#2) for current Screen Mirror servers? How can iOS avoid showing servers that no longer exist on the network?
Is there any limit to the number of networks cached by iOS, or the number of servers cached per network?
More generally, is there a good resource to read how iOS manages this issue?