[Firestore] SCNetworkReachability API deprecations.

[paulb777]

Discussed in #12592

^{Originally posted by FONickReichard March 19, 2024}
Today, I discovered that starting with iOS 17.4, several methods within the SCNetworkReachability API collection are being marked as deprecated.
https://developer.apple.com/documentation/systemconfiguration/scnetworkreachability-g7d

It looks like the FirebasePerformance/Sources/FPRNanoPbUtils.m currently uses SCNetworkReachabilityGetFlags, which is apart of the deprecations.

I wanted to pass along this deprecation notice, as it seems to be new, and ensure that y'all can catch it early if it's not already on the road map.

Best,

Nick

PS: Thanks for all the goods you create.

[edorphy]

At WWDC18, Apple teased the end of reachability by asking everyone to move to NWPathMonitor. Here is the video that will be helpful to identify the replacement that's been around for a while.
https://developer.apple.com/wwdc18/715?time=3459

[wu-hui]

It looks like https://developer.apple.com/documentation/network/nwpathmonitor requires iOS12+, @paulb777 do you known when will we move to iOS12?

[paulb777]

We plan to move to iOS 13 later this year in the next major release. I'll mark this issue for that milestone.

[edorphy]

Xcode 15, which is required in April, doesn't support iOS 11.

[paulb777]

Split Performance into a separate issue at #13079