Socket

import 'dart:io';

import 'package:bloc_pattern/bloc_pattern.dart';
import 'package:flutter/material.dart';
import 'package:mobile/blocs/settings-bloc.dart';
import 'package:mobile/screens/home_screen.dart';

class SocketWrapper extends StatefulWidget {
  @override
  _SocketWrapperState createState() => _SocketWrapperState();
}

class _SocketWrapperState extends State<SocketWrapper> {
  @override
  Widget build(BuildContext context) {
    final bloc = BlocProvider.of<SettingsBloc>(context);
    return StreamBuilder<SettingsState>(
      stream: bloc.outState,
      builder: (context, snapshot) {
        if (snapshot.data != SettingsState.DONE) {
          return Center(
            child: CircularProgressIndicator(),
          );
        }

        _socket();

        return HomeScreen();
      },
    );
  }

  void _socket() {
    Socket.connect('192.168.0.18', 1965, timeout: Duration(milliseconds: 2000)).then((Socket socket) {
      print('Socket conectado...');

      // Escutar retorno do socket
      socket.listen((data) {
        print("Retorno do socket...");
        print(data);
        socket.close();
      }).onError((e) {
        print("Erro no retorno $e");
        socket.destroy();
      });

      // Enviar string de consulta
      var str = ">?00030271";
      socket.write("$str");
      print("String de consulta enviada... $str");

    }).catchError((e) {
      print("Falha ao conectar: $e");
    });
  }
}