Atualização do mapa

lib/screens/bluetooth_connection_screen.dart

@@ -1,5 +1,6 @@
 import 'dart:async';
 import 'dart:io';
+import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:flutter_blue_plus/flutter_blue_plus.dart';
 import 'package:permission_handler/permission_handler.dart';
@@ -203,6 +204,63 @@ class _BluetoothConnectionScreenState extends State<BluetoothConnectionScreen> {
     }
   }
 
+  Future<void> _sendSignalToDevice() async {
+    if (_connectedDevice == null) return;
+
+    try {
+      // 1. Descobrir serviços do dispositivo
+      List<BluetoothService> services = await _connectedDevice!.discoverServices();
+      
+      BluetoothCharacteristic? writableChar;
+
+      // 2. Procurar uma característica que permita escrita
+      for (var service in services) {
+        for (var char in service.characteristics) {
+          if (char.properties.write || char.properties.writeWithoutResponse) {
+            writableChar = char;
+            break;
+          }
+        }
+        if (writableChar != null) break;
+      }
+
+      if (writableChar != null) {
+        // 3. Enviar um sinal simples (ex: "1" em bytes)
+        await writableChar.write(utf8.encode("1"));
+        
+        if (mounted) {
+          ScaffoldMessenger.of(context).showSnackBar(
+            const SnackBar(
+              content: Text(AppStrings.signalSent),
+              backgroundColor: AppColors.success,
+              behavior: SnackBarBehavior.floating,
+            ),
+          );
+        }
+      } else {
+        if (mounted) {
+          ScaffoldMessenger.of(context).showSnackBar(
+            const SnackBar(
+              content: Text(AppStrings.noWritableChar),
+              backgroundColor: AppColors.error,
+              behavior: SnackBarBehavior.floating,
+            ),
+          );
+        }
+      }
+    } catch (e) {
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text('${AppStrings.signalError}$e'),
+            backgroundColor: AppColors.error,
+            behavior: SnackBarBehavior.floating,
+          ),
+        );
+      }
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -320,6 +378,35 @@ class _BluetoothConnectionScreenState extends State<BluetoothConnectionScreen> {
                 ),
               ),
               const SizedBox(height: 30),
+              
+              // Se houver um dispositivo conectado, mostra o botão de enviar sinal
+              if (_connectedDevice != null)
+                Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 25),
+                  child: SizedBox(
+                    width: double.infinity,
+                    height: 60,
+                    child: ElevatedButton.icon(
+                      onPressed: _sendSignalToDevice,
+                      icon: const Icon(Icons.send_rounded),
+                      label: const Text(
+                        AppStrings.sendSignal,
+                        style: TextStyle(fontWeight: FontWeight.bold, letterSpacing: 1.2),
+                      ),
+                      style: ElevatedButton.styleFrom(
+                        backgroundColor: AppColors.coral,
+                        foregroundColor: Colors.white,
+                        shape: RoundedRectangleBorder(
+                          borderRadius: BorderRadius.circular(20),
+                        ),
+                        elevation: 5,
+                      ),
+                    ),
+                  ),
+                ),
+              
+              const SizedBox(height: 20),
+
               Expanded(
                 child: ListView.builder(
                   itemCount: _connectedDevice != null ? 1 : _scanResults.length,