several packages from this developer seem abandoned to me, it may be necessary to forked this package

Minimal changes to support null safety. Also removes dependency on wifi package that lags behind, replacing it with a simple function call. Some deprecated functions also fixed.

@deakjahn
Hi, does it work on iOS without wifi package?

I only use it on Android so I can't really tell.

@phan-dev FYI: I tried this branch and I'm confirmed the flutter_example worked fine on the iOS emulator. (iPhone 12 Pro Max; iOS 14.5)

For _getLocalIpAddress, maybe use this package instead. https://pub.dev/packages/network_info_plus

import 'package:network_info_plus/network_info_plus.dart';
final info = NetworkInfo();
var wifiIP = await info.getWifiIP(); 

@joeyw7 I tried to add it to my fork (https://github.com/deakjahn/ping_discover_network) but the package would need some refactoring to work well with the new Android embedding. I can't test on iOS, either. It wasn't my original intention to create a new independent fork, just to create the base PR but I don't know if this gets abandoned now here or not.