> On Feb 24, 2015, at 8:58 AM, Jens Alfke <[email protected]> wrote: > > >> On Feb 24, 2015, at 2:29 AM, Stéphane Sudre <[email protected] >> <mailto:[email protected]>> wrote: >> >> Instead of polling, another solution depending on the nature of the >> unreachability could be to observe network settings changes (DNS, IP, Active >> Interface, etc.) using the SystemConfiguration Dynamic Store API. > > That’s exactly what the SCReachability implementation is supposedly doing for > us.
Oops, forgot to add: And there are a lot of sources of unreachability that are not visible directly to the device, so SystemConfiguration can’t notify about them being resolved. For example, an intermediate router going up/down, a remote link failure, a DNS server being updated. If you want the program to be able to connect without explicit user intervention, it does need to poll. —Jens
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