Reachability on local network

I'm looking for a way to monitor if a device is reachable on the local WLAN network using its IP address (for example ). I already tried the Network Reachability API without success (I don't get any update even when disconnecting the device from the network).

The idea is to be informed when this IP address got reachable/unreachable to inform the user of this event.

Any idea how to get it working? Or is Reachability not the right tool for this?

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