flutter - ICMP ping on iOS works on simulator but not on real devices - Stack Overflow

admin管理员组

文章数量:1296920

So I am making an app with flutter that performs ping scanning to find devices on my local network. I am using this package /packages/flutter_icmp_ping

I have noticed that there are some specific ip addresses that my real device cannot ping and returns PingError.requestTimedOut

The problem though happens only on the real device test while in the simulator (and other similar apps like Fing) it is able to ping the same ip perfectly.

Here is the

import 'package:flutter/services.dart';
import 'package:flutter_icmp_ping/flutter_icmp_ping.dart';
import 'package:ip_scanner_ios_new/sidemenu.dart';
import 'package:provider/provider.dart';
import 'package:shared_preferences/shared_preferences.dart';

class IcmpPingResult {
  final int seq;
  final String response;
  final double time;
  final bool success;

  IcmpPingResult({
    required this.seq,
    required this.response,
    required this.time,
    required this.success,
  });
}

class PingPage2 extends StatefulWidget {
  @override
  _IcmpPingPageState createState() => _IcmpPingPageState();
}

class _IcmpPingPageState extends State<PingPage2> {
  String _host = 'google';
  int _count = 5;
  bool _running = false;
  List<IcmpPingResult> _results = [];
  double _packetLoss = 0.0;
  final _scrollController = ScrollController();
  Ping? ping;

Future<void> _runPing() async {
  setState(() {
    _running = true;
    _results.clear();
    _packetLoss = 0.0;
  });

  try {
    print('Attempting to ping $_host'); // Debug log
    ping = Ping(
      _host,
      count: _count,
      timeout: 5, // Increased timeout
      interval: 1, // Decreased interval
      ipv6: false,
      ttl: 64, // Changed TTL
    );

    ping!.stream.listen((event) {
      print('Raw ping event: $event'); // Debug log
      if (_results.length < _count) {
        final time = event.response?.time?.inMilliseconds.toDouble() ?? -1;
        final success = event.response != null;
        final response = event.toString();
        
        print('Ping result - Success: $success, Time: $time'); // Debug log

        setState(() {
          _results.add(IcmpPingResult(
            seq: _results.length + 1,
            response: response,
            time: time,
            success: success,
          ));

          _packetLoss = ((_count - _results.where((r) => r.success).length) / _count) * 100;
        });
      }
    }, onDone: () {
      print('Ping stream completed'); // Debug log
      setState(() {
        _running = false;
      });
    }, onError: (e, stack) {
      print('Ping error: $e'); // Debug log
      print('Stack trace: $stack'); // Debug log
      setState(() {
        _running = false;
      });
    });
  } catch (e, stack) {
    print('Setup error: $e'); // Debug log
    print('Stack trace: $stack'); // Debug log
    setState(() {
      _running = false;
    });
  }
}

  @override
  void dispose() {
    ping?.stop();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(         drawer: SideMenu(),

      appBar: AppBar(
        title: Text('ICMP Ping'),
      ),
      
      body: SafeArea(
        child: Column(
          children: [
            Padding(
              padding: EdgeInsets.all(16.0),
              child: Row(
                children: [
                  Expanded(
                    child: TextField(
                      decoration: InputDecoration(
                        hintText: 'Enter host name or IP address',
                        border: OutlineInputBorder(),
                      ),
                      onChanged: (value) {
                        _host = value;
                      },
                    ),
                  ),
                  SizedBox(width: 16.0),
                  SizedBox(
                    width: 60,
                    child: TextField(
                      keyboardType: TextInputType.number,
                      decoration: InputDecoration(
                        hintText: '#',
                        border: OutlineInputBorder(),
                      ),
                      onChanged: (value) {
                        _count = int.tryParse(value) ?? 5;
                      },
                    ),
                  ),
                  SizedBox(width: 16.0),
                  ElevatedButton(
                    onPressed: _running ? null : _runPing,
                    child: Text(_running ? 'Running...' : 'Start'),
                  ),
                ],
              ),
            ),
            Padding(
              padding: EdgeInsets.symmetric(horizontal: 16.0),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Text('${_results.length} of $_count'),
                  Text('${_packetLoss.toStringAsFixed(1)}% packet loss'),
                ],
              ),
            ),
            Expanded(
              child: ListView.separated(
                controller: _scrollController,
                itemCount: _results.length,
                itemBuilder: (context, index) {
                  final result = _results[index];
                  return ListTile(
                    leading: Icon(
                      result.success ? Icons.check_circle : Icons.error,
                      color: result.success ? Colors.green : Colors.red,
                    ),
                    title: Text('Sequence ${result.seq}'),
                    subtitle: Text(result.response),
                    trailing: Text('${result.time.toStringAsFixed(2)} ms'),
                  );
                },
                separatorBuilder: (context, index) => Divider(),
              ),
            ),
          ],
        ),
      ),
    );
  }
}`

本文标签： flutterICMP ping on iOS works on simulator but not on real devicesStack Overflow